Just put another hour and a half in. I stand by all of what I said above. The game really is fun. The all star mode power up you pick up sometimes is lol (at least for Ulala, she has backup dancers on their own flying platforms dance along side you while you dance). The weapons stuff is all pretty run of the mill otherwise, I do like the swarm of bees though. It goes out infront of whoever is 1st and above a dozen large bees/wasps stay on the track and you have to maneuver through them and if you hit one you spin out.
The other races modes are neat from what I've seen. There is rival mode where you race against like 4 other racers and you each have 3 health and whoever lives till the end wins. There is a drift mode, and a few others that are all pretty decent as well. They are scattered throughout the World Tour game mode that is setup to where you beat a race to unlock another and it branches to go into other races. You use stars from finishing races to unlock barriers to more races and to buy extra characters.
If you are a kart racing fan, you will really enjoy this imo. If you are a Sega fan, you will really like a lot it has too. Lots of maps, Skies of Arcadia, Shinobi, Billy Hatcher, Panzer Dragoon, Samba De Amigo, and more.