Doom 3 that a lot of players took issue with -- and no, we're not talking about the protagonist's inability to hold a firearm and a source of illumination at the same time. The element was the game's enemy spawning mechanic, which would make baddies appear when the player reaches set points in the level -- a practice which has since been nicknamed "monster closets." Fortunately, it seems id's next angrily-named project won't feature this oft-harangued spawning system.
In a recent interview with 1UP, Rage lead designer Matt Hooper explained that enemies in a certain section of the game's demo will be "doing whatever they're supposed to be doing. If they're supposed to be defending against you coming there, they'll be doing that. If they're just tinkering or having a conversation they'll do that." Sounds like id's AI has actual motivation now. Well, motivation beyond "scare the crap out of then murder space marines," anyway.