Saying this would probably get me a lot of hate in some places, but I can "forgive" Sonic 06 while I'm playing as Sonic and Shadow. Silver to a lesser extent, mostly because I'm actually good at the game and I had enough foreknowledge to not suck my first time playing it (while skipping all cutscenes and taking a bathroom break at some point I got through half of Sonic's story in a little under an hour). Now don't get me wrong, I do think it's a bad game, I do think there were some inexcusable mistakes (such as the infamous Wave Ocean line in Shadow's playthrough, link for those who don't know: http://www.youtube.com/watch?feature=player_detailpage&v=svEuWgN81KY&t=459 ), and I also think the gems shouldn't have been in the game, mostly for how broken the Sky Gem is ( http://www.youtube.com/watch?feature=player_detailpage&v=z7wRkCE5saY&t=612 (I found out the invisible box is literally a box, if you go on top there's an invisible ceiling) http://www.youtube.com/watch?feature=player_detailpage&v=-g1qw8VR_tA&t=70 ), so yes by all means it is a bad game. And yes I have played the hell out of Sonic Adventure 1 & 2, I have played Sonic Colors/Colours (just for the Brits here :U) on the Wii and Sonic Generations on the 360, hell I've even dabbled a bit in Sonic 2, Sonic 3 & Knuckles and Sonic CD, and I'm sure someone'll be happy to know that I like them, not too picky with the many generations of Sonic as long as it's not the first one, so I'd say I know damn well what a good Sonic game is.
But the only part that made me wanna ragequit was S ranking Sonic's Crisis City on Hard mode, and not even the end of Silver's Dusty Desert on either difficulty gave me any trouble, I cleared the Hard mode Billiard From Hell on my first try. I do get a kick out of Sonic's stages at times and Sonic's Radical Train on Normal and Shadow's Kingdom Valley on Hard are my favorite stages in the game. I can see why so many people hate the game, a lot of the things they hate happened to me too, but overall I had a more positive experience with the 360 version of the game than most people. Notice how I didn't mention the story at all in this little wall. It sucks, as far as the game's concerned it never happened even though the last line of the game doesn't seem to understand how reset buttons work, and overall it's just not worth mentioning.