I usually end up getting gang-banged because the entire enemy team shows up. That also happens whenever I spawn. It also happens whenever I decide to take a peak around the corner that the rest of my team didn't think to look behind. However one on one, I always come out on top because once you armour lock, all the opposition has to do is count the seconds, throw a grenade it goes off just as they come out of lock, and then follow up with melee. Or they could exploit it and assassinate you before you come out of lock. I've had that happen to me and I've done it by accident a few times.