I got this game the other day when it was a daily deal on Steam and wow, I was completely BLOWN AWAY!
Haven't spent much time in solo mode, but the multiplayer is almost perfect for me. Great balance in the powerups, no randomness and excellent arcadey controls make me wonder why this was shrugged off by many and isn't regarded as the best kart game ever. Unlike the sometimes bullshit randomizer that Mario Kart feels like, I have never been able to blame the game for screwing me over with some overpowered powerup. When someone hits me with a powerup and passes me right before the finish line I feel outwitted rather than unlucky.
The only thing I'm missing are some more fantastical themes in the stages which would make them more memorable, cities are pretty boring to race in and the cars don't have the personality of the Mario Kart characters and could have been presented differently. Also the network code is a bit bad sometimes with it dropping me out just as a race is about to start or giving me constant lag in some instances, but this is more of a peripheral problem to me which I can see past in the cases where it happens.
If anyone wants to race, my ingame name is Quaternion. I would love to see some sort of NeoGAF tournament if there is any interest for it.
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