Pretty dull. Very tiny level, textured in a quasi-Shores of Hell way. You
start off, shoot some sargeants and humans, get a shotgun. Fight a
caco, get a rocket launcher. Fight some demons get a chainsaw. Then the big
fight. Go into a large room, fight four barons, take them out
quickly with the 6 BFGs Reiner has thoughtfull provided. The surprising
thing is is that this isn't the exit room. The exit room is behind an
unmarked secret wall before this room, meaning that you can just miss out on
the end fight completely.
There's also a DOOM marine voodoo doll in the level for no apparent reason,
but you can ignore it. Or, in fact, just ignore the wad. This took
all of about five seconds to plan out, and about ten for me to play.