We used to play with another married couple quite a bit when H2 came out. Haven't done it in a while though, but it was a blast. 4 person FFA on Waterworks took forEVER.
haha, my girlfriend plays with me occasionally. i played occasionally and like 2 when my friends little brother had his old xbox, but i got REALLY hooked when my other buddy moved in with me and brought Halo 2 with him. We played so much. lol