Sonic Forces is yet to be released and yet people are already saying that it's bad SMH!
You're allowed to judge a game off of trailers and stuff, that is what they are for but don't say that it IS good or bad, say that it LOOKS good or bad. A good example is the pretty recent Crash N-Sane Trilogy. When demos and stuff were shown off people got kind of scared but when it came out about a week or so ago most people liked it.
I don't think that Sonic Forces looks that great, but who knows what I will think when I play it? It could be amazing, or really bad for all I know but I don't know yet because it's not out and because it's not out no one has played the full game you're just playing a demo, which is unfinished and more polish will be put later. I know that the demo of Sonic 06 was more polished than the final build, and what we wound up with was not what it was originally intended to be but I think that that's not going to happen again, especially since Sonic Boom was released. I won't go into full detail but Sonic Boom was originally going to be different from what we got, but the game was announced on Wii U without the developers knowing and since they were aiming for a PC release they had to remove a lot of content. Content such as level, better controls, more combat variety, there was so much left out.
I mentioned Sonic 06 having this too and again I won't go too much into detail but basically 06 was originally going to be a back to basics reboot of the series, but the head of Sonic Team at the time Yuji Naka left the team to create his own company so the other developers didn't really know what to do anymore so what was going to be a back to basics game turned into a big ambitious and divisive experience. That and the game being rushed for the December 2006 deadline caused quite a lot of cut content, glitches, and overall an experience that didn't live up to the hype, and actually got a lot of people to bail from the franchise.
Either way I don't think that this will happen again, and while Forces does look mediocre (my opinion) we still have Sonic Mania coming out which looks like a masterpiece. Again it could be bad but overall I *think* that Mania will turn out good.