Unreal Tournament is a classic. The entire game just keeps you playing and because it's so easy to make maps, mods..

User Rating: 9.8 | Unreal Tournament (Best of Infogrames) PC
..mutators etc, you can keep playing this game time and time again and feel like your playing something new everytime. UT has some very nice graphics, the maps are great, the weapons are supurb and the gameplay is addictive. There are so many maps out there as well as mods that the game feels like multiple games in one. Definatly a game to get. Although UT2K3 and UT2K4 are out now, this is the original, and the best. An amazing game. The bots are the best put in a game and multiplayer is a blast. Everything from the bots to the map design is top notch, this is a must have for any gamer.