I think what Lunaran meant is what was written on his website: http://www.lunaran.com/news.php (In the same news update as Pissboat)
Quoted Relevant Bits:

Needless to say I'm not done with Doom3 yet, spending so much time in the Leaky City, but so far I'm bothered by the same stuff a lot of other people are.

Some of the combat is really cheap. The goal of level design is not to hurt the player however you can, id. It's to put the player in danger of being hurt. Survival should be up to the player's reflex and ability in avoiding that danger. When you leave spring-loaded monsters that cannot be dodged and hitscan enemies that do too much damage for their accuracy, you leave survival more up to luck of the draw. Even if you know all the little surprises and tricks they use in each little scene (especially the oh-so-lovely 'monster randomly shows up behind you while you're shooting something else' device this game beats to death) you still have to play it over and over, quickloading until you're satisfied with how much health you lost.

That, of course, will need to be fixed. When crafting the Byzantine project, I vow to never cheaply spawn enemies directly behind you and not make any noise or anything to announce it. I also vow that should an imp get too close and use its claws, your vision won't be thrown off by a whole fucking radian, just so you can, you know, actually still have a chance of killing it. Also, when they jump at you there will be a slight pause to recognize it, and if you sidestep in time they will jump past you. Remember fiends? Those guys were awesome.


So basically what I think he's getting at is whining that id in their maps used a lot of cheap tactics of having, say, imps lie prone just on the other side of a door so they could spring on you the instant that door slides open. Almost hopeless to avoid unless you crouch up to every door and throw a handgrenade under it and run away.
Lunaran is also a bit put off by the fact that imps can jump at all I recall reading somewhere, but I think it's kewl dud3 ^__^.
Although, I too am a little bit annoyed how insane the damage feedback is; Being nibbled by a trite will make your vision throw back 120� as if the player had some sort of vertical owl mutant neck.

...

In other news, the little test map I've been making for d3 already has a monster spawning behind you. Doom 3 makes baby jesus cry!