i think a lot of people are complaining about lag and what there actually complaining about is a couple of things that make it harder to kill, the hit detection boxes being made smaller, and the auto aim being less "sticky". which i kind of like. forces you to be more acurate, in BLOPS 1 you could shoot near a guy and still hit him, especially from a distance, and now i find myself shooting between their legs and missing. additionally there are a lot of attachments that used to be perks, like the stock and fore grip laser sight ECT....., and when you combine these in the new ways the pick 10 allows you too you can become particularly deadly. which people also have to get used to.
You so funny