I'm glad you made this, I didn't know anyone else felt this way about Doom. On the last few missions of Doom 2 I was overcome by this feeling of dread and that night when I went to sleep I had dreams not dissimilar from this. Under all the rip and tear bravado, there's something kind of unsettling about Doom you really touched on here.
Thanks! Yeah, and I don't get the same feeling with the newer dooms. One thing I remember clearly was running over all the corpses of the monsters I'd slain, while backtracking looking for a key or door. Something about how the corpses just hung around and didn't disappear like in most other games stood out to me.