Decent lighting, architecture and layout for the time.
Only 9 monsters, (only zombiemen) so there's no difficulty here of any kind...
This feels like this would be far superior as a deathmatch map. The map's layout has a fairly good flow - I think fragging a couple friends here would be fun, after a few changes in the map.
Great Doom 1 single map wad, for us strange Doom 1 people.
Complex, non-liean design, entertaining ambushes sprinkled around keeping you on your toes, with balanced ammo, and not much health lying around.
This is a very long map, however, (30-50 mins), and it can get a bit boring after a while, especially when it comes to the - otherwise neat, very heavy metal-ish - music.
Do give it a try.