Somebody got me this as a gift. I hadn't really planned on getting it, but I decided to try it out. And I'm really glad that I didn't miss out on this one.
Gameplay: 8/10
The races themselves are amazing. Everything, including transformations and terraforming, flows together smoothly for a nice, clean race. Air and ground controls are excellent, but boating is a bit touchy. In addition, all of the offensive items are grossly overpowered, which can really drag down a race. An improvement over the first one comes from the fact that the all star is no longer a beat-all killing machine, just a temporary speed boost and a regular strength attack.
Soundtrack: 10/10
Wonderful.
Voice acting: 7/10
The voice acting for this game is high quality stuff. The problems arise from the fact that it gets awfully repetitive, especially when you play as Danica Patrick (okokokokokokokokok).
Graphics: 9/10
The environments are gorgeous. There are a few hiccups, but it's still great.
Final rating: 8/10
Yes, it's not very detailed. Sue me.
Hold others at gunpoint and make them come here.