I would suggest you try barebones (if you haven't) its fun and provides a good change to your usual game mode.
Its awesome to send someone flying back when using the shotty's.
What I meant with camping solution, was (and I didn't mention in my original post) I ran into people "hiding" or waiting and with the SG I was able to win the fight with ease before a single shot was fired. So it could be an additional solution to those pesky ones who hide.
Oh, yea, now I see what you mean about the campers. And, I agree 100%. Running through any inside corridor, to find the enemy ADS in the corner. It is much easier to hip-fire a shotgun round right at their face, then scramble to bring a gun up ADS to kill them.
Thats impressive, specially the one dude on the balcony. Thanks for sharing.