ORIGINAL: Anomie
I have to agree about 3 and 4, but I must admit that 3 sure was intriguing when it hit the shelves. All those new textures, more polygons, curves... it was lovely to look at.
WHAT!?
Quake 3 (and more significantly Q3 Team Arena) are still hailed as the finest multiplayer twitch shooters ever made. With Q3 and UT2k4 out at the same time, FPS competitors never had it so good. Awesome awesome games, both of them.