This is a nice and interesting map, I think, this is one of the best maps of year '96. I didn't like only cubbish outer walls (shown on this screen); also, someone can get angry because of continuous jumps over lava (although, I passed this place without problems). And, finally, there is a bit rough spiral stairs (I felt through it a couple times, though, without damage).
On the other hand, there are good layout, unusual level-design and interesting gameplay.

The Downward Spiral on The Quake Grave

I was pretty impressed with The Downward Spiral! I agree with all of xDDGx's points above, he is right on the money. Though there are some things strange about it, there are a lot of positives here. The map has a good flow to it, it has traps and events in almost every room and offers a great experience for the first year of Quake's release. I say check it out!

A fun map--it's rough around the edges but fairly inventive. Very good for 1996.

I should have mentioned that the screenshot is the worst part of the map visually. That put me off of playing it for a long time, but when I finally downloaded it I found that the rest of the map is much better. In general, the visuals are on the plain side but still decent.