Well I bought this the moment it appeared on PSN so I could have a decent play with it. A vast improvement over the predecessor in nearly every aspect, there are some slight issues here and there (momentum regarding the spin dash is one) but they don't adversely effect the game too much in my opinion. All the levels are fun in one way or another and the difficulty curve increases are a decent pace as you go through. Bosses are surprisingly fun after the chore of the bosses in Episode 1, all are original (bar the ones that are meant to be homages to earlier fights) and keep you on your toes, the final boss is absolutely brilliant and something I've actually come to enjoy fighting, something I haven't been able to say about a final boss in a Sonic game since Sonic and Knuckles.
I will say one thing though, the guy who designed the special stages can go **** themselves. . . Seriously, this game, despite essentially being a love letter to longtime fans of the series, (who still complained, I don't know why they bother) this game is primarily going to be picked up by kids, and the special stages, especially the last two brought me to a frenzied rage. The only good thing is the game gives you the ability to restart special stages, not sure if it was intentional or an oversight but i sure as hell abused the hell out of it. I think I restarted the final special stage about 50-60 times, and in the end I completed it with 1 goddamn ring to spare. . . through 60 tries I memorised the pattern of this goddamn special stage so I could probably do it blindfolded and I still just passed it. Not that it matter though because apparently Super Sonic is broken and actually is less useful than Normal Sonic. . .
All in all, bar the rage inducing special stages I thoroughly enjoyed this game.