This is very hard to respond to while remaining civil, they'll (the zombie server) get bad maps, some good, some bad, rotations will change, big deal, get over it.
Now for an actually thought out response:
Players aren't the only ones on the server, that's usually the case, there are staff, and not all staff play, not nearly to the extent of the average player (which is what makes players players and ops ops,) anyway, runner maps tend to have minimal rule breakers, you can't really be unreachable or pillar or be in a hiding spot smaller then 2x2x2, the big ones, the rules most commonly broken, an Op gets the lucky chance of a "break," they wait around for 10-6 minutes and do nothing, you might think "oh but that's good for them," NO, Ops need to be alert, be on their toes at all times, this isn't only for the sake of the server, it's for their sake, a bored op (Nothing intended) is an Op that doesn't want to be there and that just means they're more likely to resign, if an Op wants a break they post an official thread and come back in 1-4 weeks, it legitimately adds up and I'm not just pulling this out of my ass, I've seen it happen and am partial a result of it.