Single player almost exclusively. I can probably count on two hands how many games I actually play multiplayer for, and only on one hand if we're talking competetive multiplayer. I really only like multiplayer that is laid back and not terribly competitive. I am personally enjoying the Dead Rising 2 multiplayer. It's not GOOD multiplayer, but it's laid back. You get bragging rights for being first, but you still get to transfer money to single player even if you're last.
My girlfriend are always on the hunt for good co-op that can be played on a single TV, but it's rare that we find one.