Get it. You'll like it.
GOOD: The super cute graphics will wow you and make you want to sit closer to your television. It's simple and fun. My 5 year old son was able to beat the final boss on his own, yet the mini games offer a challenge for advanced players. The gameplay is super-intuitive and, since there is practically no penalty for dying in the game, it's perfect for the whole family.
BAD: It's too short and the mini games aren't much fun.
CONCLUSION: This is the cutest and most fun $40 I ever spent. Go get it. You'll like it.