DOOM monsters that piss you off...

[DecemberMan]

Pain Elementals and Revenants for all the reasons already listed in this thread. Archviles to a lesser extent.

[death-incarnate]

Pain elementals are the most annoying enemy for me because even if you do kill them they leave behind more lost souls

[Doomguy 2000]

I'll go with the Pain Elementals as the most annoying monsters simply because it could sometimes take more ammo to kill.

As far as custom monsters are concerned I'll have to go with the Tourettes Son (Purple Imp). This creature not only sounds like a wuss but is very annoying believe me. He is the kind of monster that runs from you but has the power to fire rockets and BFG balls as his melee attack for those who don't know. The Tourettes Son IMO is a double fear monster that he fears you and you fear him.

[wildweasel]

I don't think it's fair to specify things you've created yourself.

[NeuralStunner]

I don't think it's fair to specify things you've created yourself.

Is it fair to specify other ZDoom users?

[.ex.inferis.]

Revenants, when they are spammed without much room to maneuver/cover and chaingunner when you they spawn to your blindside and unload on you. (I'm looking at you, Plutonia! )

Also, since some people have mentioned custom monsters, I'll go ahead and include the Tornado Demon. If you can't lock it into a pain state quickly, you'll be bounced around all over the damn place.

[FDARI]

I had a bad chaingunner experience at some point. Chaingunners behind a "secret"-ish wall (they can shoot out, I can't see in, I can't see where the solid wall stops and the midtexture begins, and I can't charge through and put my tormentors in plain view; however I later found the same room from the other side where it is no pain at all - how arbitrary). Chaingunners don't annoy me. Mappers with chaingunners annoy me.

I think I quit that game a little while later, thinking something along the lines of "That mapper does not wish me well".

[Hellser]

After playing DooM for so long, there's only so many monsters that don't really annoy me, except when used well;

Mancubus in packs.. in small-ish rooms.
Archviles working as a duo team.
Shotgunners in an ambush-like formation and you're stuck with a rocket launcher.
Chaingunner "torches" (where they sit half way across the map, just picking your health off 1 hit per minute.)

[Doctor-Dos]

I hate it when amateur mappers put a Baron of Hell in the first level, come on... I need more than a pistol!

And let me just say, I HATE GROUPS OF ARCHVILES!!!!!! NO FUN!!!!

[Ixnatifual]

The only stock Doom and Doom 2 monster I don't love is the Spiderdemon. For a boss he's a bit boring, to be perfectly honest.

[NeuralStunner]

The only stock Doom and Doom 2 monster I don't love is the Spiderdemon. For a boss he's a bit boring, to be perfectly honest.

Big, slow... Fewer HP than a Cyberdemon, and hitscan attack doesn't quite compensate. (Even if you remove the BFG from the equation.) On UV there are some other monsters around, but too distant to give you much (if any) trouble, once you know what you're doing.

Not sure how one could improve this.

[Dynamo]

zombiemen

[Cyanosis]

Original: Chaingunner, Hell Knight, Pain Elemental, Revenant, Mancubus, Archvile, that's almost the entire Doom II cast

Chaingunners, Pain Elementals, Revenants and Archviles being obviously universally hated, but the Hell Knight is deceptively evil when used nastily (early levels of Hell Revealed II has made me never see them in quite the same light again) and Mancubus have difficult projectiles to dodge (I'm almost always running into them).

ZDoom Doom Style: Bruiserdemon and Diabolist (I love their design a lot but I hate fighting them unless they're heavily tweaked) and any really stupid boss monsters with a bazillion health and spamming retardedly powerful seeker missiles (like Azazel). Also don't like Catharsi, I just think they're weird, and it's too obvious a Klesk reference to Quake III for me to take them seriously in any scenario they're depicted in. Also don't like any straight rips (Cheogh, that goddamn Cycloid Emperor, and so on).

ZDoom Heretic Style: Death Knight (once again awesome design but a pain in the ass to battle).

[MR.Rien]

I hate chaingunners, revenants and archviles.
Chaingunners because ..well, the time you realize from where you're ambushed you can be very easily already turned in some "corned Doom Guy".
And the chaingunners, from far , hitting you time to time and you can't spot him grrrr.

Revenants because , well... I hate their seeker missiles even if I got a better hold of it since I play some Doom Frustration like the last levels of Scythe 2.
Archviles. Well, does it need to be explained?


In custom monsters? Hum....Cheap stuff like railgun zombie. Unstrafable as far as I tried, die in one shot most of the time. That's just crap.

[Zombieguy]

Lost souls, Pain Elementals, and Archviles.

And I don't think I need to explain why.