Unreal Tournament was the quintessential multiplayer frag 'em game of the early 2000's. UT2K4 is the best of the entire series! The gameplay is fast and furious and the graphics are impressive even on a low end system.
I build cheap computers for families and student. When I pop in UT2K4 and hook them up to a LAN game, every eye in the house is watching the screen. I have friends who are not considered gamers, yet even they push their way into a chair and ask about controls.
As for the gameplay, it's a straightforward shooter game with not much plot in the single player mode. You are an athlete in the Unreal Tournament games which pit humans, robots and aliens against each other in brutal firefight duels to the death. You must win your way up a ladder and through the championship in order to secure the trophy. You have an arsenal of weapons to use that are scattered around the levels. And your opponents will obviously be tougher and tougher to beat the higher you climb the ladder.
But it's in multiplayer mode that the game really shines. Integrated chatting system and voice comm help keep you connected to your friends. And there is no greater rush than to go up against another human player.
Well worth the download price. Download for a friend and I bet you two will have an amazing time with this game.