Might I interest you in becoming a staff member of my recently made group, "Nations"? It's an RP where the user controls (a) nation(s), and, naturally, would attempt to let it strive. Such an elaborate RP would require help. Perhaps it's not that elaborate, but hard enough to make me ask for help. Feel free to join, even if you have no intention of becoming a staff member. Just click on "newest" in the groups section, and I should be somewhat near to the newest, considering I made it just now.
Now, back to the subject at hand; I suggest playing Tribes. This may be a biased recommendation (I'm pretty sure all recommendations are, to an extent...), but I have been a fan of Tribes for quite some time now, even playing it on the PS2, Aerial Assault. It may perhaps be on of my favorite FPS games.