Well this game has basically trumped all other multiplayer shooters, in my mind.
Stopped playing about a dozen other games almost immediately after discovering FF.
Granted, I still play RuneScape, Day of Defeat Source, Xonotic, and will be starting up some classic Doom in the somewhat near future. I'm always on the lookout for awesome indie titles with relatively low spec requirements, regardless.
How about you? What other MP games do you currently play?