Depends on what do you mean with multiplayer! I play excellent the Asphalt series on local wi-fi, Dungeon Hunter 4, Star Warfare, its a fun shooter that plays well too.
Instead of that ****ty answer that you got i would say that those games depends more on your internet connection than the device itself.
So with multiplayer you include games that go by "turns" you could include Royal Revolt II, and all the xbox live games include leaderboards wich is some kind of multiplayer too.