I've seen more campers using backup in this game. Playing with a buddy who watches their back with an AR or LMG and between the two of them equipping extra lethals and mining the poo out of the place with IED's they can develop an effective blockade. For a minute anyway. They only get me once.
It's a reasonable strategy, but they really should learn to MOVE once they've got a kill or two. It's not like there's only one place per map where they can camp after all.