Rainbow Six 3
The best game on Xbox Live as of the date this was written. (Summer 2004) It currently has a sequel/expansion known as "Black Arrow," which is exclusively on the Xbox. Though the single-player campaign on both games are a little "imperfected", the multiplayer is amazing. Sadly, many people are going to ditch Rainbow Six 3 for the newer version of Black Arrow. (stated above) The lean glitch has been fixed, and the .50 cal rifle has been removed and replaced by a Dragunov, Black Arrow has something worse than the two problems combined; spawn-killing. 79% and plus players camp at the other team's spawning point and snipe them in the head before the have a chance to even move. Ubisoft, the game's developer, is working to fix this problem. A good solution is to put a 2-second invincibility counter on the spawned player. so that he can actually kill the spawn-killer first. All in all, Black Arrow introduces new gameplay modes and maps (including the downloadable ones from the original Rainbow Six 3) which is not to be overlooked.
Rainbow Six 3 is a great tactical shooter. All players must bow before it!