My favourite and only online games I play were/still are:
Warbirds 3 (Current)
Enemy Territory: (With ETPro Mod) Splash Damage
RTCW: Didn't Nerve make it? (Dead)
Battlefield 1942 (for the lulz, still play)
Quake 3 and (I admit it Team Arena, still play, LIVE)
Quake World/Quake 2 (long dead for me)
I used to play co-op doom on the serial cable with my bro.
Sorry, Jerryk, I missed Tribes somehow, not sure how, but I'm sure I would have enjoyed it.
I also tried several UT demos but they didn't capture my attention.
I like twitch action with all the complexity you can throw at it, meaning team based objective orientated shooters. I've owned the 'new' team fortress for a couple years but only played it for ten minutes, so I can't judge it.
id has made a big difference in my online gaming life, whether directly or indirectly. They rock.
RTCW I actually played through about 1.5 times, but it wasn't great, it was okay. I liked Quake 4 better (Raven mediocraty?). I agree, this will be more of the same with bloom and boring thrown in. But we'll see, in about two years when I see it in a bargain bin.
Risen has hope for me, that's about it.
I'm dissapointed with video games these days.