Impressive visuals and scale for its time.
Epic memes are thankfully limited to secret areas.
map04/final quarter stretch is extremely cheeseable compared to the rest.
Plenty of time spent cleaning up turret enemies.
Do not play this in ZDoom-family ports. An incompatibility with Boom breaks progression in MAP01. There is a cool effect where a tech column barrier blocking the way to the red key basement is "disappeared" by what I believe is a short-lived scrolling floor effect; this should happen after handling the Hell knight teleporter chamber in the northeastern wing that comes off the main yard. I verified the correct behavior in Eternity after banging my head on the wall for at least a half hour if not longer; this is probably the source of the frustration felt in the comment dated 3/27/07 and the anonymous comment where the player knows where the red key is but can't access it.