Improving maps won't help.
Improving popular maps will give you a positive result. Once you done that, you can do improvements on other maps. Eliz you are willing to make improvements, but all your effort will go downhill once improved maps are played couple times. Players won't play other maps than popular ones. Since people play for frag and points/honour etc, then add more points on other maps you receive, since hospital is the only map to give you loads of points if you are in successful team and of course, you get double points as VIP.
I have no plan into looking at other maps, whats needs to be done because no one will pay it, lets take example (by counting how many maps this game got). Do people play maaps or AA3 maps? No. Look how much effort you done in fixing bugs, glitches there but people played couple times. Give them SF maybe on other maps, they want gun with scope as example on pipe sf