Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
If you are a true Sonic fan then this game shouldn't dissapoint you. I think it's 2 times better than Sonic Adventure 2 Battle. Sonic Heroes is just a great game. Now let me comment on the gameplay, graphics etc.
Gameplay: Glitches might happen here and there but overall it's not that bad at all.
Graphics: Wow the graphics are pretty good for a Sonic game. It can be a little blurry though. I wonder why people think the graphics in this game are bad. Maybe they just have bad eye sight.
Sound: The voices aren't too bad. Tails and Cream have annoying voices though. The music is pretty good. And the sound FX are decent.
Value: Well you get to choose from 4 teams. You can unlock a new mode. With all of that this game has pretty good replay value.
Reviewer's Tilt: Pick this game up if you like Sonic games. It shouldn't dissapoint you. Otherwise you're probably not a Sonic fan.