XCOM 2: War of the Chosen

XCOM 2: War of the Chosen is essentially a more complete version of the vanilla XCOM 2 Campaign. I originally played the XCOM 2 Vanilla campaign, but after playing through WotC i realized that was a mistake. For everyone that is trying out XCOM 2 for the first time I would recommend playing wotc and ignoring vanilla campaign. WotC is a feature complete version of XCOM 2, it basically adds factions, covert ops that allow you to promote soldiers that you arent using or get more supplies, etc which breaks away some of the repetitive parts of the xcom 2 vanilla campaign.
Furthermore, it adds 3 new big bosses called the Chosen that not only play a big role in the campaign but are also fun challenges to tackle with providing op rewards when you finally defeat them. Its basically the best version of XCOM 2, there is no reason for you to play the vanilla campaign, since this has everything from the vanilla plus an absurd number of new features added on top of it.

This DLC is essential in my eyes. It fixes a number of issues with the base game, while changing the pattern and feel of the campaign, somewhat.
Xcom has had trouble finding ways to motivate players to use more than a dream team of soldiers for a whole playthrough. Now, in addition to injuries, fatigue is an issue. The fatigue system ties to soldiers' will stat as well. No longer will your team of rookies begin soiling themselves the second a squaddie suffers a hangnail. Rather, will drops at a steady rate the longer battle goes on, making panic more likely to occur later in a mission. In my experience, however, soldiers rarely panic unless directly made to via psionic attacks. This is a welcome change, IMHO. But it is different.
This brings me to the bond system. Soldiers that go together on missions can be bonded together if you want. This gives them powerful abilities when deployed together, particularly at higher ranked bonds. When a bonded soldier dies in battle, you're about guaranteed his buddy will lose his shit, firing wildly at the nearest enemy. I've had this work to my favor a few times, but mostly it's another bump in the flow of battle.
The new classes are fantastic. So great. When I first saw a Templar, I began firing wildly at the nearest enemy. In my case, it was the blackberry bushes growing just beyond my window. But I digress. I think of these new classes as a sort of officer--a hero class. I wouldn't risk bringing them all on one mission, but I always try to bring one. Their abilities can shape whole battlefields. They make the rules.
A high ranked templar can bound across a field, split an enemy in half (100% accuracy btw), and erect a shield in front of him, tanking any attack. They can fire lightning bolts through groups of enemies, become immune to fire and poison, or teleport-swap with an enemy, or ally. This world is ours! My personal favorite.
Reapers can run through missions with impunity--their "shadow" ability means enemies can only see them 1 hex away. Under the right conditions you can dash past everyone, find the enemy commander and detonate a gas station right in his face. Two pods dead in an instant. No joke. It'll leave a fiery crater in the woodwork, and you won't even leave stealth. A high-ranked reaper can wield skull jacks thanks to the "Infiltrator" perk, ignore armor, and God love those claymore mines. Many times, I've used a reaper to torch an Advent Facility all by his lonesome. Didn't even fire a shot. Just get ready to run, cuz he'll lose stealth when he plants that bomb.
Skirmishers fly through the area on grappling hooks, yanking enemies out of cover or launching themselves right at them--give em the claw. Skirmishers are particularly good at acting multiple times. Rank him up and it's not unusual for him to act 3, 4, or 5 times in one turn. They can take down an entire pod of enemies by themselves, in a single turn if positioned right. Grenade the group, grapple topside, Shoot one (Hair triggers are your friend), Wrath grapple another, and duck into a house with Implacable. 2 dead, one wounded and wide open for a teammate to finish off. Skirmisher is smokin' a cig through the window.
If all this sounds too powerful, your enemy is even worse. If you play with ALL the DLC, you have your work cut out for you.
The lost are a welcome addition. Lost missions break up the routine of flanking and dying to Advent. They're challenging in their own way. Trying to meet an objective while an innumerable horde of zombies charges your squad...it's sweat-inducing. Sometimes they'll charge Advent troops instead. I always do a happy dance in my head when this happens. Trust me. I do.
What's better is all the mods out there that require WoTC. I'm telling you, mod this piece and you'll have fun for years.

This expansion adds a large amount of very high quality content to the game. Fighting against "the lost" requires a whole different strategy from fighting advent, and "the chosen" are the bosses that "rulers" were supposed to be in the much worse Alien Hunters DLC. I would recommend playing through the vanilla game without WotC first, but then playing with WotC is a must. It makes it almost a whole new game. I would say this is the only must-play DLC for this game.

I haven't seen my fiancee in a week.
My circadian rhythm is very out of whack.
I dream of drawing alien blood in the battlefield.
10/10 - Would do it again.

THIS EXPANSION IS THE BEST WAY TO PLAY XCOM 2. PERIOD.
The Chosen are very tough but this expansion adds multiple paths to victory (or defeat) which is important in a STRATEGY game. The Chosen are everything the Alien Hunters DLC should've been. Their strengths and weaknesses are randomized so they're never the same twice. Over time they get stronger but so do you! And if you manage to get enough reputation with the corresponding faction... then you're given ONE CHANCE to kill of The Chosen for good. The fights are intense and the Chosen drops are 100% worth the fight. I love it.
The three new factions along with their Covert Operations add a whole new dimension to the base game. It's absolutely amazing. I personally like The Templars because who doesn't like a psychic that can use their mind to make laser swords over their hands?! If you like sneaky bois then The Reapers are for you! And the Skirmishers... Well they... skirmish? They're cool though.
I haven't even gotten to the fact that almost every new voice actor in this expansion is from Star Trek: The Next Generation. For those interested I'm referring to Ryker, Troi, and Worf.
My favorite part of this expansion though? FINALLY NEW WAYS TO DEAL WITH THE AVATAR PROJECT TIMER!
Ugh, I nearly had to change my pants the first time I sent out a covert operation to reduce the Avatar Timer.
I wholeheartedly recommend this expansion.

The only "right" way to play X-Com 2 is with the War Of The Chosen expansion. I tried the base game, didn't like it. Put the expasion, it has become one of my all-time favorites.

The base game of XCOM 2 is fun, but war of the chosen is we're the game really shines. It is to this day a symbol of what a true DLC is like. It is worth every penny and if this game/DLC is on sale you should buy it. The game offers a good challenge and fight's that should provide you with tension through and through. I like the idea of the Chosen and i really enjoy encountering them in missions. So much so that i both enjoy/hate doing the mission we're i go to their lair and kill them. I like doing the mission because of the push feeling it offers but i hate it because i hate eliminating the chosen from the game. It wasn't till a little while after defeating all 3 chosen that i realized just how much they added to the game. Knowing that they won't pop in at any moment to ruin my day removes some of that tension feeling the game provides. Sure later on in the game if you build up your technology you can take out the Chosen easily if you get the jump on them on time.
I also like the bond system your soldiers can have, i always loved making 2 soldiers work together. Especially with content from the Workshop. The workshop is expansive as ever and offers a lot of creative content. Some are cosmetic and some are gameplay tweaks. You can even get mods that enhances the enemies making the game even harder.
To conclude XCOM 2 is the ultimate game of chess meats RNG. If you make a poor choice and suffer the consequences you will reflect upon that incident and think to yourself "what could i have done to save him/her from that strike" Never have i been so sad to see one of my soldiers die right before me.
If the game is on sale get it, you won't regret it.