Wow, this game's actually kind of FUN! It highly reminds me of Mario Karts but a PC-alternative for it.
It's really mostly a light and fun game. You join in some random game, it has various modes possible. So far I've seen free for all and team mode. In team mode, the trick is to NOT hit your team mates with your weapons. That proves to be harder than it looks!

There really are a nice variety of maps available. I've seen so far: Arctic, Halloween, jungle, race track, and there probably are a bunch more type maps. Some are real tricky. The arctic maps, for example, could have a bit a slippery road so that corners will be a bit harder. Others have poles right in the middle of the tracks (to divide the road in two), the trick is to NOT hit those poles!

Some have bridges that are a bit narrow, so, aim well!
You can upgrade your looks, apparently. I'm not sure if you can earn the money for that in-game, or that you have to pay real money for any changes. I'll have to figure out that one, but I'm not likely to pay real money for it. If I can pay for it with in-game money, I'll probably go for it.
You can make buddies there. Chatting is kind of amusing. Some people have a bit a short fuse but you're best off just to ignore them. The main reason one would want to play this game is a bit of fun insane racing where you can bombard, throw banana peels, boost, etc. If you're playing this hardcore then there is something really wrong with you.

The interface, before you start any game, leaves a slight bit to be desired. If you get used to it, it ought to be easy. But it wasn't 100% intuitive in the beginning. Tip: Check that 'back button' next to the 'garage button'. That usually brings you back to the main menu of sorts.
But, basically, this is a Mario Karts clone, for the PC. And I have to say, they've done it pretty nicely!