Most of the time I just back out if I see the next map is Cairo at this point. If i do stick it out I see people on the roof tops every other match. I'm torn, often if I see a full squad on the roof it means they aren't capping points and usually we end up winning the match. I also enjoy posting up with a DMR and a view of the roof to farm them until they give up on the roof spawn. It does need to be addressed though. I believe i read in the patch notes that they had already fixed a couple of the other spots on the map and hopefully will continue to do so. If i catch people on MY team climbing on the roofs I try to figure out where they're doing it from and blow it up with a rocket or C4 to prevent more players from doing so. I shouldn't have to spend my match time policing the habits of exploiters but until they fix it it I don't mind doing so.