Second to Unreal Tournament
Unreal Tournament is a far greater game. I found this game to be bland as it hasn't changed much from the original quake. Also Unreal Tournament has native support for Glide which allows me to run the game at a much higher resolution. Unreal Tournament also has 5 differnet game modes whereas Quake 3 only has Deathmatch and Team deathmatch (although eventually capture the flag will be added). I'm going to spend my money on the full version of Unreal Tournament and keep Quake 2.