>>11844689
007 - Agent Under Fire
Black
Cold Winter
Darkwatch
Half-Life (exclusive Decay EP + I think the campaign is worth replaying for its differences)
Killzone
Mace Griffin - Bounty Hunter
No One Lives Forever (some exclusive stealth missions)
TimeSplitters
Urban Chaos - Riot Response

These all range from good to great. Nightfire, Timesplitters 2 and Future Perfect as well as Medal of Honor - Frontline are best played on GameCube (MoH Rising Sun is also okay-ish).

There are still a few PS2 FPS games I need to play but I can't emulate PS2 anymore since my GPU died