Sonic Forces

Honestly, it's not broken or really unplayable. It's just....boring? The level design is so flat and sterile with these weird mechanics that hold your hand. In a platformer. Classic Sonic even has these rigid mechanics and weird unnatural caps on his abilities. And the custom character is just very clunky with combat that is not satisfying at all. Way too easy a game. Was over in 2 hours.
So what are the pros?
+It's gorgeous
+As usual, the music is FIRE and this is a very unique soundtrack for Sonic
+It attempts a very different story for the series which is bold (even if it falls flat)
+The character creation is very fun and you can make some surprisingly good looking stuff despite the initial memes about "huh huh DeviantArt Sanic OC's"
That's about it...
It works. But it's not fun. Just get Spark the Electric Jester 2.
Love the blue bastard to pieces. I'll always be excited for his next major adventures. But sometimes, we just take these L's until SonicTeam eventually wants to figure out what works.

go into the options, turn off the radio chatter. while playing skip all of the cutscenes, and try to get all of the collectibles. This improves the enjoyment factor of the game ten-fold. You can also try only skipping some of the cutscenes, to occasionally be rewarded with the out-of-context ramblings of a cast of one-dimensional anthropomorphic characters deep in the trenches of world war 3.

Yes. Sonic Forces is one of the weakest Sonic games.
No. Sonic Forces is not a bad game.
Sonic has to save the world (again) from Eggman and his new sidekick Infinite. This time he is joined by you, the rookie.
Being able to create your own avatar is really just a gimmick, and although some of the power-ups the avatar can use are pretty fun (at least at first), they would have been just as fun to use if Sonic had been the one using them.
The game is really short, fairly easy, and trying to stretch out the game by forcing you to play through a stage three times in order to collect all the collectibles is a pretty scummy thing to do.
Still, I did enjoy the game on my first playthrough, and if you're a Sonic fan you'll probably enjoy it as well. Just play through the other Sonic games first if you haven't already, as they are pretty much all better than this one.

Steam has to finally add option to make neutral reviews.
This game has a lot of flaws, but they really tried and from this point i just hope that Sega and Sonic Team will improve what they made with Forces (still needs to be done: better characters, less plot holes, less nostalgia) instead of creating something like Lost World 2.
Pros:
+Amazing soundtrack, obviously
+Step in better direction from Lost World
+Creation of your own character
+30 levels and few special ones
+Eggman is actually smart
+Some new neat gameplay mechanics
+Nicely done comic-like feeling to the game
+Double boost mechanic that can be interesting if they improve it
+Really good conclusion to the whole story
Cons:
-...but story feels rushed, so it undermines that conclusion
-Takes 3-4 hours to finish
-Levels are only 1-3 minutes long
-Classic Sonic and levels with him don't fit here at all
-Classic Sonic is from another dimension, ruining this way almost non-existing story of Sonic Generations
-Death Egg fits this game, Chemical Plants could get a pass, but Green Hills should be thrown away
-Most characters are irrelevant
-Waaaaaay too many plot holes
-We're thrown into the game with barely any introduction to anything
-Silver, who lives 200 years into the future, is here for some reason
-Tails is a coward who can't do anything on his own
-Most boss fights are boring
-Most levels barely have any additional routes you can take
-Infinite's potential as a character was wasted
-Wisps are getting annoying to see in every game
-Not really that much to do after you've completed the game
This game tried, but has a lot of wasted potential. I could recommend it for max 50% of the base price if you're a Sonic fan or don't mind cons i've listed. Ideally waiting for at least 75% sale would be worth buying it.

It's really damn short. About 3 hrs for the main story. Creating your own character is completely unnessecary and classic sonic felt really out of place here. Yet the game was still fun to play none the less. Music is cool, boost tracks are nice and playing as the self created character is fun even though swapping him with an existing character like tails would make more sense.
For €/$10 it's a fair deal. Wouldn't give more than that for it.

Wait for this game to go on sale, do it for the mods. We got Overclocked coming out and stuff. I wouldn't recommend this game vanilla, but it's still kinda fun doe.

If you don't take this game too seriously, there's some fun to be had. Avatar creation is pretty fun to mess around in and the soundtrack is honestly one of my favourite things about the game. Levels are really short and getting high ranks is at times embarrassingly easy. And that's on the so-called "Hard Mode".
I think the biggest con about this game is that there was potential to add so much more based on the story and tone of the game. Like maybe a hub world where your avatar can talk to the various Sonic characters and do some unique side missions.
While I recognize that objectively, this is a pretty mediocre game, I had a blast playing it because the gameplay was fun to me and the story was adorable in how campy and serious it's trying to take itself. Plus it was a short game, and I'm fine with that.
TLDR: If you're a Sonic fan, you'll get more out of it and have some fun. Anyone else, ehhhh it's a big maybe. And at least it'll be a short playthrough.