Yea, if you mod your rifle (I use the semi-auto rifles, they do more damage than sniper rifles somehow, even more than the .50 cal).Even in action mode?
Because if so then I'm bad at the game (which wouldn't surprise me)
The main mod I use is the one that increases damage when zoomed in... so all alarms are a walk in the park, as are cameras...
Heavies are laughable, and once you get the backpack and rifle that allows you to shoot through walls, then tanks and choppers are piss easy too, just aim and shoot at the pilot/driver... Or just emp the shit...