Broken Base: With each game, a split in the community happens. Almost half of the Unreal community will stick to the first Unreal Tournament, no matter what other Unreal is there. The remaining part has a notable presence of Unreal Tournament 2004 people, plus those who play the non-Tournament games and those who play Unreal Tournament III.
Game-Breaker: The Shock Rifle combo and the Sniper Rifle. The former is a guaranteed One-Hit Kill on anyone within range, the latter is guaranteed death with a headshot. Only the latter has had any sort of methods undertaken to nerf their effectiveness, generally giving it someform of visible, obvious indication of where the shots are coming from.