This is, without a doubt, the worst level so far. Romero's conscious decision to make the walls "sticky" in narrow corridors and on precarious ledges makes this map unnecessarily frustrating and is completely antithetical to Doom's gameplay loop. If it weren't for these sticky walls, this map would have been excellent - the enemies are well-placed, and ammo is scarce enough to make you think but not rare to the point of annoyance. Also, this is the first time you are properly equipped to deal with a Cyberdemon, so that's interesting. Damn you, Romero, for sucking the life out of a great map simply for the sake of trolling.