This is not the attitude you need! Bad zazu, baaad baaad zazu!
I've checked your map in the editor, and I've found the concept very nice.
BUT!
The map is very poorly edited, but since you're a beginner, it's not faulty. You're just doing things wrong

1st: the bridge is ok, but for arched parts, one should use the so called "end caps" (it's under the curve menu option. To see how they work, simply open maps from Nexuiz, that use arches (farewell, final rage, stormkeep comes to my mind).
2.: First, I've only looked at the 3d window, and by selecting brushes, I've seen you've used the CSG subtrakt tool a lot. That is a neat tool, but only works well for simple geometry (that has either 90 degrees angles or 45, and snapped to grid). When I'e looked at the center tube, I've said "omfg" IRL too

I'll have a hard exam tomorrow, but I'll correct your map after that at some parts, so you'll see what you should do differently, and learn from it.

3.: Also, the lack of "detail brushes" and "caulk texture" is disturbing
