Are you kidding me? If your getting sniped on Bloc then your doing something wrong. I can't even think of the last time a sniper killed me on Bloc, its the worst level to snipe on. I just run around executing snipers who are prone and crouched. Yes, I take the time to pull my pistol out and double tap them in the back of the head, I do it so when they watch the kill cam they feel like a total tard for sniping on that map in the first place.
I think some people probably don't like it because sniper rifles are so dominant on it
It's because everyone wants to snipe on Bloc, but they always die by people who aren't retarded and use a silenced SMG and just go around killing everyone in the buildings.