I loved the bullet time in OG Max Payne game (2001).
I was addicted to EverQuest since I started playing it in 2001 for at least 10 years. They don't call it "EverCrack" for nothing. No matter how I feel about it now, it will always hold a special place in my heart.
I also played PlanetSide MMOFPS for at least 4 years since it released back in 2003, and it was so great. I hear both good and bad things about its successor, PlanetSide 2, but haven't tried it for the fear of it ruining my nostalgia of the original.
Starsiege: Tribes was an awesome game too. I was a beta tester for that one way back in '98, in the days before broadband was a thing. I still have an installation CD hand-signed by the devs that they had to ship to all the testers, because downloading 500+ MB over dial-up was not feasible.
Earthsiege 2 was the game for which I went out to CompUSA and bought a joystick that had swivel function (MS SideWinder 3D Pro).