I jumped around on this yesterday for a little bit and have some comments for you. The design seems solid (only did a forgethrough, no gameplay yet), but you might want to reconsider allowing players to get up
on top of the bases so easily. It seems like I'm breaking the map but I'm guessing that you made it that way intentionally. My recommendation is to lose that aspect to allow players to focus on the rest of the map's rather nice layout. There are plenty of areas for players to move through without having to potentially screw it up gameplay-wise by having some douche with a sniper picking you off from up top (I can see every aspect of the map from up there, and could easily duck back temporarily without having to leave the area entirely if I were fired upon). That's my biggest gripe about the layout, everything else looks like it would play very well.
Spawn points need a lot of work. You've got them
facing walls and even worse, pointing towards open areas where you'll
fall off the map. As a general rule, you want to give a player a couple of seconds of forward travel before having to make any lateral movements. When I place spawn points, I stand where I want to spawn, then turn to monitor and place/rotate the spawn point in that direction. It takes a bit of extra time, but it's well worth it in the long run.
Anyway, just wanted to pop in an offer my two cents. When I get a game on here I'll be back with more feedback. Overall this seems like a well-designed map, it just needs a few more tweaks (definitely the spawns). Good luck, man.