Maybe it was just me, yet I was completely unable to understand the "slingshot" method of passing your team member's karts and, as a result, ended up finishing dead last in every race I tried (about 5 races). After 5 races of finishing dead last, I decided that no game should be this frustrating to play - consequently, I ended up sending it back to Gamefly.
You only get 4 tracks to start off with and I wasn't able to open up any new tracks. I didn't play it very long either as I found it too boring for my taste and lost interest in it rather quickly. It's a Mario Cart wanna be and it's most definitely not this. I love Mario Cart as you change characters and play mini games too in addition to the tracks. I much prefer Mario Cart over this game. I did find it easy to control and figure how to weapons. Having to stay linked or trying to anyway with your partner to be able to do the slingshots was dumb. I was able to do this but didn't get why this was part of the game. If you want a fun racing game stick with Mario Cart and just skip this one. I guess it's worth a rental to try but I wouldn't buy it.