I played this with bots today; not the best way to test a map by any means, but I did get a good idea of the gameplay. To start off, I must say that this is a pretty damn good layout for a first map. Healthpack placement is good and overall size is great. You seem to favor all the classes' play-styles pretty well (some a little TOO-WELL, but I will get to that later). The accessible roofs make for some interesting gameplay, although I would recommend maybe increasing the height of some buildings and adding a playerclip on top to make some classes like demoman/soldier a little less effective.
As you will see in these screenshots, being on the roof of the closest "short" building to spawn gives you a HUGE advantage over the entire playing field.
A single "ninjaneer" can dominate the entire battlefield.
32 points in a single round without giving up the point once is quite significant.
A single Demoman with a Scottish Resistance can easily see the entire play area and take out enemies before they can react. It was very effective, I got about 25 points in one round without dying.
On a final note, I would like to say that the overall map was a bit dark. It was lit just fine around the capture point and the insides of the buildings, but in some areas players completely disappeared in your peripheral vision.