You need to do more research for recreating real locations like Pripyat. I can see that you have used couple of pics to create some places from Pripyat and even they aren't very accurate. Compare:
Real YoursYou should have collected lots of real photos from the net, watch videos and study some soviet architecture to really recreate the amazing athmosphere that Pripyat offers. Source isn't really good for open enviroment and in DM it tend to make games really boring. A small suburb from Pripyat might have been better idea to recreate for DM.
The map itself isn't crap, I like the harsh lightning, it seems to run fine for such a enourmous map and has its own athmosphere. Map just isn't what you claim it to be: a recreation of Chernobyl or suitable for DM. I think that ropeplaying community would love a map like this (I don't rp myself, but this reminds me of better rp maps).