Only just surfaced so can't think straight, but Hot Wheels Unleashed 2 is a fun racer with split screen.
The original was good fun, but ruined as a 'play with friends' experience by two really stupid decisions:
1) You couldn't join a lobby as a group. So impossible to guarantee you were playing with your friends.
2) You couldn't have bots in a multiplayer race. So you couldn't have a race with a couple of friends without the track being too empty for it to be proper good fun.
Have they fixed either of those pieces of stupidity in the new game?