An adequate platformer, this game is brought down by shoddy controls (I feel like there's a lag, but it could be the timing problems posted here and elsewhere), awful cameras that don't always show Mickey or his next destination (requiring you to jump blindly and hope for the best), and overall quality issues (e.g. audio balance for surround systems, frame rate at launch, etc.)
It's not the worst way to spend a weekend, and if you get it for a few dollars, I'd say take a chance. Otherwise, there are so many fantastic platformers available, why settle for something average?
edit: Maybe I'm being too hard on it, so I'll come back and update once I've found all the collectibles and whatnot. In the meantime, I will say this: It's a pretty easy game, and the visuals and audio (despite the bizarre volume levels) are both nice. In other words, it could totally pass as a great family game, or as a gateway title. For these reasons, I've changed my review to a positive.