i'm not much of a player, myself, but i'm deadly at fps games. it's just not fun unless it's on a LAN though. lag needs to be under about 20ms to really make the game fun.
i'm a huge fan of run and gun basically endless ammo games. in a lot of games you have to be a bit more careful, i play a lot more games with stealth mechanics in them now but when i first started playing stalker i was forever running into anomalies and being slaughtered by mutants and gopniks.
quake and similar games are great for parties, everyone gets so hyped.