Simply the best online game ever made, and the single-player is good as well
Simply brilliant multiplayer mode
No lag on servers, game FPS is stable
Wide range of options to play with
Mods/Mutators are excellent
Over 40 maps shipped with the game
Map design is excellent
Long lasting appeal for both single-player and multi-player
Bot AI is very sharp
Voice communication possible
Return of assault mode, great scripted maps
New Onslaught mode, brilliant
Bad:
Single-Player game does not have a storyline
Weapons can be a little unbalanced
OVERALL: UT2004 is a great all round package. The single-player is a joy to play with the intelligent AI and the mulit-player is even better, providing months of gameplay without boredom because of the sheer number of maps and mods that come with the game. Probably the only game you will ever want to play online and offline for a very long time indeed.