I bought Sonic hoping for a modern platform game for the family.

We lasted an hour and a half before giving up with the game.
Totally disappointed.

Buggy camera, found we could end up going through solid objects, nothing to strive for. Obviously not designed by the same people who made Sonic for the Sega (bless its cotton socks).
No challenge or anything to strive for. The game obviously didn't have a director to make sure it had a plot and direction. I've seen cheesy teen movies that had better plots!

If you're hell bent on buying this game, go rent it first before buying... That's my advice.