That Doom2 MAPO1 remake actually looks pretty polished, visually.
shot3 of that map (of the large room just before the exit) looks really good.
people always seem to think of e1m1 first when thinking about doom, but map01 always comes to my mind first. :)
Tabun is a main developer for Generations Arena (that Q3 mod with awesome models and asshole license) so it is no wonder the map is gorgeous. http://www.tabun.nl/