Excellent
I think those bad reviewers see a Sonic parody and automatically become convinced it's crap. This was hilarious and terrifically animated.
I don't know much about Sonic. Like I don't know why they're in a spaceship or who Chris is or what a hot dog is doing there. I do know who Amy is, but that's only because I played Mario vs. Sonic at the Olympic Winter Games for the Wii. But in a way, my ignorance just made it funnier.