I love the sawed-off, sure its a cheap gun but its takes a level of skill to get up close in the action for the kill plus I always sucked at shotty battles. Got a 3 for 1 with sawed-off the other day, win.
I just hate how you can be up close to someone with a Gnasher, and they'll have a Sawed-Off; and you can shoot right before them or at the same time, and the Sawed-Off somehow still does more damage and kills you. It's happened to me a lot.
Also, i'm already almost in the top 2000's worldwide in quick match Execution. ;D