The average and slightly above average COD player has no understanding why the COD games are enjoyable to them, so all they did was complain. They complain about skill-based match-making, they complain about "noob weapon spam," they complain about having bad teammates, they complain about spawn camping, they complain when the maps are big enough to not have spawn camping. They literally judge the game by how well they do in it and anything that levels the playing field (i.e. they're not stomping kids in matches) makes it bad.