Pretty good for your first map. Gameplay is alright but could be better. It is a bit hard to navigate but that isn't hard to fix, some wider walkways would do nicely. Texturing is pretty good, everything looks like it goes together. I especially like the teleports :) The detailing is ok, as you said, it could be better.

Overall 3/5

Very good for your first map :)
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http://www.freewebs.com/fergusonproductions
http://halleck.tumblr.com/

I'm sure that if you REALLY tried your best, then it can't be bad. The screenshot looks better than my map's, so I'll playtest yours and then tell you what I think. Catch: when I release the new version of MY first map, promise that you'll test mine, deal?

Alright, here's what I think. The gameplay isn't bad, but it feels a bit cluttered, especially on the lower floor. You should consider removing some of the boxes, although I love camping inside of the open one! :D The air vent was a neat trick, another spot for campers to fight over. The health is a bit bunched up, but other than that, this is a good map! The use of textures was pretty good too. 3.5 out of 5, keep it up!