This is some pretty neat stuff right here.
In this game you can revive the old Wacky Races. You can play as all the characters of the cartoon. Each character has its own set of advantages/attacks and becomes more powerful once you finish the Adventure mode. There are many types of battles here. From the traditional race (composed of laps, with the exception of very few maps), from special Deathmatch maps where your objective is to take out your adversaries instead of winning a race. There are also other kind of gamemodes, such as the "Gold Muttley" challenge or the Dick Dastaldly challenge.
All the maps are well done and it is especially fun to play them with friends. In a way this game reminds me of Crash Team Racing as the gameplay mechanics are pretty similar (There are weapons here as well). As I already mentioned the game supports up to 4 players races/battles which manage to be much more fun than playing against the AI which at times may become boring (even though it's pretty well done).
All characters are unique and well balanced. Three of them have to be unlocked by finishing the Adventure mode though. They often say things when they're winning/losing/attacking/getting hit, mostly resembling those said in the cartoon series. And this is a good touch to an already entertaining game.
So in the end, there is really nothing wrong with this game. I especially suggest it to those who like the cartoon and those who are looking for a game similar to Crash Team Racing. It's well worth your money.