Medal of Honor:
Tried a couple of the older games, pretty decent. I think the new upcoming game will be the only one released on current generation consoles though.
Battlefield:
I had Battlefield 2: Modern Combat for Ps2, and it had the most underrated online gameplay EVER. It was so good, it rivals most fps online multiplayer shooters today. I loved being support and healing my mates, calling down artillery, and using my heavy machine gun ranging in maps from Desert towns to oil rigs to port facilities. The only real mode was domination, but it was still fun as hell to play online.
Call of Duty:
I'm a Call of duty fan, and my favorite game was COD4.
Halo:
Only played a little bit of ODST campaign in a navy exchange once, doesn't seem that bad of a game.
Team Fortress 2:
Never played it.
Counter Strike:
Never Played it.
Half life:
Shame on me for being a slowpoke and not trying it.