I was really impressed when I've seen this map for the first time, some months ago, and again, I couldn't restrain myself to write an enthusiastic comment, now that you've made it available to the public.
First off, the architecture and texturing are simply awesome: this map is a joy for the eyes, especially for those (like me) with a passion for middle ages and ancient buildings. It works quite fast even on my old computer, as opposite as I had thought.
The size, and the long corridors make it a bit dispersive if we're considering ffa and especially instagib, but works perfectly in DMSP mode (just tested before, with lots of monsters) and the fun is guaranteed, also it would be great if used as a scenery for an SP mission, to me.
Back to online DM and capture mode, I can't be as drastic as the previous comments did, in my judgement: what happens in almost every popular map? People concentrate on the main open space, until the big carnage happens. So, in your map, people would have more chances to get lost between those long corridors, therefore facing random people on 1 vs 1 duels, and the fun would be more than when you have 15 players shooting each others in a bullet's orgy.
Clearly, I'm talking about big matches with at least 10 persons or more, otherwise it would be hard to find each others, but as stated on the features, this is a large map, and works better when crowded.
My rating is 5/5, congratulations for your efforts: I think such a big commitment deserved to be recognized.