It seems like for the last 50 pages people are complaining about all the same stuff they have been for every call of duty since the holy lamb that is Cod4. Quickscopers are shit. Spawns are shit. Hate a map. Hate a gun. Its all the same crap that has been said before. Once you accept the fact that yes, this game has flaws just like every other COD before it, you can have a great time shooting and having mindless fun instead of nit picking at all the things that COD had been for the past 5 years or so.
Except plenty are complaining about the Lag Compensation which has really only gotten much worse since BO1, a lot of the problems are simply related to that and it has gotten worse each iteration of CoD for the last 3 games.
Spawns do suck, some weapons are crazy, and the map design isn't the best it has been, but a lot of problems will disappear once we start getting patches that try to balance things out, just because something is ok or alright doesn't mean you can't complain about it. Complaining about people complaining is just as bad as the complaining itself, lol.
As for quick scoping, treyarch tried to nerf it slightly iirc in BO1, but they seemingly didn't have the nerve to do it this time.