Quite possibly the best Sonic game to hit a home console ever!
The graphics.....well......they're pretty. The cut scenes around the end are absolutely amazing but it's pretty sad that almost all the cut scenes were made to look like a book I mean ok the game takes place in a book but if you can do beautiful cut scenes like at the end of the game why make it like a story book. The in-game graphics are pretty good but at the same time, the characters edges look sort of rough.
The Sound isn't that great. They use the same song for most of the game not to mention when it finishes it's played over so your stuck listening to a never-ending D- never heard of rock band. I never found the characters voices bad and it's the same for this game so no complaints from me with that. If you don't like the English voices though you could put the Japanese voices which to many is considered better.
The Gameplay is the thing that makes this game amazing. With right timing the controls are amazing. It's too bad that not many Wii games use this type of control scheme. The only flaw I say about the controls is that when you try 2 move back with Sonic it doesn't always work and on top of that you can't see when you moving back besides that you should love the controls.
I'd say this game would last you at least 2 weeks but if you take your time like me then 2 months. And if you want to unlock everything you can add at least 1 or 2 weeks to that. And if you have more people to play with then the game's lasting value can end whenever.
So in conclusion I say buy it. It's a superb game that you'd love and cherish. Not to mention it was a pretty low price tag right now.