Based on what I've played in the beta, I reckon ModNation Racers has better gameplay than Mario Kart: Wii, too. The weapons aren't cheap like Mario Kart's are (no blue shells here), and the boost system is really cool.
(Basically, the boost meter is filled up by skidding around corners, doing tricks in the air, attacking another player, or following in another player's slipstream, and you can then use this stored power for speed boosts, shields, and to shunt other players. Choosing what to use the boost for, and when to use it, adds an awesome tactical level to the game that Mario Kart lacks.)
If they can fix the bugs and the frame rate issues (and in the 6+ months of dev time left, I'm sure they will), it's gonna be teh super awesome.












