This problem has been solved by illegalizing camping. There are four signs throughout the bases that warn players that camping is strictly forbidden. If this is not enough to convince players not to camp, please provide suggestions.
Your plan has one flaw, what if newbies cant speak english? :p
Anyway, i think the problem with camping would solve adding another floor to the map as well as making gameplay more fun. This way, if the map would ever get played there would always one camper sitting in base.
ALSO, add glass to the sides of your side entrances to the base so you can see camper on one side and this can fully focus on the other side where flag is without having to care about being backshoted as soon as you step into base (i mean those holes on the sides, not FD)
Moving on to main, its too empty, add some stuff there preferably another stone or ramp to jump to 2nd floor which you could add :p
Also, i would prefer main to look like this
.
Makes much more sense, because you can move in the whole map without having the movement impairment from water.
And if you changed main like i suggested, you could add scafolding
1 on one side, solving the emptiness of your map (making it look like something is being fixed on one side :p)
As for mid, the gameplay there is pretty decent i would say. Its probably your first map which wouldnt get me totally bored, when someone picked it.
And one last thing, get some better sky texture, this one sucks :p
And pls, work on the lighting more, it could look soo much cooler just have a look at the picture above. The light emitting down the ground looks really nice, try reaching it somehow in BSP. Not saying that i am sure its possible (because its BSP so it might not be), but at least try to make it look like the image above (lighting wise). This map has so much potential for details and really cool lighting, try to use it fully :p
scafolding
1
INSPIRATIONhttps://www.google.cz/search?q=underwater+tunnel&client=firefox-a&hs=XHn&rls=org.mozilla:en-US:official&channel=sb&source=lnms&tbm=isch&sa=X&ei=0zdSU-uhO7TH7AaIjoCQBQ&ved=0CAgQ_AUoAQ&biw=1680&bih=946