When Colors came out, I was in the middle of a "Man all of the Sonic games after SA2 have been mediocre at best" mood so I missed out on it. I did see the internet praising the game left and right, though. After I played Generations a bunch I went back and picked up Colors and it's.... okay. Like I didn't hate the game, but it also felt pretty generic and not very fun. I got up to that desert level - Sweet Mountain, I think it's called? - before I got bored. Still need to get back to it one of these days.