Looks great. I'll test drive it right now.
INITIAL PLAYTEST RESULTS:
Ok, so I've played it for about 20 minutes and my initial response is that the map itself looks great. Good detailing but not too cluttered. Item placement was great, ammo stashes were nicely placed, reachable but not too heavily placed. I will admit, some places are really easy to defend, but with saying that, said places do not contain many items. I could hold out in the corridor where you start for some time if I placed plenty of gas cans at hand. Eventually, however, I was forced to move when I ran out of supplies. If I had been playing with human players, I may have been more successful, nonetheless, I managed to reach bronze, meaning it's not too easy. So kudoes!! =D
I began to lag a little bit from time to time, but not much of an issue. And you had so better create a custom loading poster, for pure awesomeness's sake!