When I played through this map, I can see why no one has shown it any love but I thought it was a fun "mow all the guys over as quick as you can" type of challenge. Could it have been done better? sure. Watch me play it here: Kill 'em All on The Quake Grave

LOL, I did it in about minute (nightmare skill) after 4-5 attempts. Too bad, the only way to leave level is death... from the other side, it is some dark irony... I think, this level is like some kind of task or challenge, so there is no need to make some extra nice-looking design (although, it could be done more accurately). But it's interesting to done this only once. Maybe, if the author made a couple more tasks, it would be more interesting.

That screenshot is the whole map. That's the whole thing. Is there really anything I can say about this at all? It's awful. 1/5

Another "big box with lots of stuff to kill" map. No exit.

This one does have two redeeming features. Firstly, there is some minimal attention to texturing (the floor has a proper floor texture!)

Secondly, and more importantly, there is an element of strategy here. There's a lot of stuff to kill. All monsters start with their back to you, meaning you can decide what order to aggro stuff in. I found that encouraging in-fighting between different monster species buys you enough time to grab the quad damage at the very center and mop up anything that is left standing.

But still, there isn't nearly enough here to merit more than one star.