Sonic's bad voice actor!
Tails had an OK one. X had good one but why can't anyone ever fit personallity into the Sonic voice actors. When you here Sonic talk in the games or in the shows he doesn't sound like he's high. In this he speaks everything and puts in no emotion, it makes Sonic not Sonic. The mistery box was also horible in the scene scelection for music. It sounded like me on a guitar and I can't play. The animation wasn't bad though and you're right for warning us about the sound, it's loud!
On a side note, I like this a lot I just hope Sonic doesn't sound so crappy in the forth one.