ok.. finally got around to play it online and give it a try
First of all there is no armor around (except two at the top near the rocketlauncher. Given such an open map everyone and especialy flag defenders are sitting ducks against MG or nexgun, both of which can be hard to spot in such an open map. So i think its a good idea to place an armor and maybe a 100 health near the flag, mabey right in front of the 'base'. Also a ring of 5 health/armor packs around the base might help and look good too
Some more health might be good and also having less groups of health. Three packs at once? Thats almost as good as a single 100 health. I"m not sure but was there health at the bottom at all?
Regarding sitting ducks, i think a MG near the bases and not just one for the whole map might be good. Also i'm not sure but it seemd the weapons next to the bases are distributed unfair. One has crylink and the other one mortars? Not sure about this though.
More weapons in general would be good too, just add some more. The map is quite big, i doubt one can do it wrong. Also the shotgun is a bit strange as its the starting weapon.
The terrain can slow down quite much, maybe try to make some parts near the bottom less steep?
Maybe you can try to make the sides more clear.. maybe add some red/blue tints to the tracks near the bases and maybe some marks on the trees?
In general the maps looks really nice but its seems very heavy on the antiwallhack (there was a SERVER LOAD warning while i played) not sure if it was because of the map. Maybe culling hints can help. Divverent should be able to tell how he improved capturecity with them.