Kill 'em All (Yes, i got it from MetallicA)

Map is for Doom 1, and is looking good (for 1995). But this map is extremely crampy. Corridors and rooms are small and narrow, enemies are packed tightly. It could be challanging, but there's so crampy that they aren't effective at all. Fighting 2 barons in arena sized like matchbox isn't pleasant experience... Overall: graphic 4/5, gameplay 1.5/5

This had promise, but the problem is that it's much too cramped - if it was scaled up by 25% it might have been an unexceptional retro level. It has a certain amount of detail and competence, but in its current form it's just aggravating to play, and looks ugly. You fight 65 mostly weak monsters in a dungeon. Lots of health and ammo, which you don't really need. Seems to be the author's only single-player level; he also did a couple of DM maps.