Complete lack of any AI for the monsters

[Walkiry]

The rest is "If my 'personality' is 'coward', my health is <50%, and enemyhealth > myhealth, run to nearest powerup." Otherwise, follow the pathnodes, and you'll be allright. (I'd say that intelligent use of the said pathnodes most probably makes up the most difficult part of making bot AI good)
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That's hardly fair, considering that FPS games, just like the AI, don't just consist of deathmatch and just deathmatch anymore. Unreal Tournament bots have more complex behaviours in non-standard modes, for example. And you may want to take a look at the F.E.A.R. demo ;-)