The community is apparently still active. I have a friend that pretty much plays this on a daily basis and he never mentions ever having problems finding games to play.
And this is why I think this game got boring for me:
Gold Rush: matches usually degraded into attackers shooting explosives at the crate, rather than actually planting, so it basically became impossible to defend. The only real places you could defend were underground, since you can't really blow a hole through the floor. Otherwise, just blow a hole in the wall next to a crate, and proceed to shoot rockets, tank shells, hell, even JDAMS depending on the crate, or lay 2 lives worth of C4 on it.
Conquest: Conquest just degrades into running circles around the map trading flags. Since you can only communicate with your own squad, you can never really coordinate things well enough to hold many flags. This is very prevalent on larger maps, such as Oasis.
Once I unlocked all the weapons/gadgets, I pretty much lost all interest in the game.