I've seen some pretty good use from people with armour lock, i once had a rocket i fired sent right back at me, i called him every name under the sun, but i had tocommend his superb timing and use of it. I once used it at the top of the red lift on swordbase when i heard a guy come up, released it as he got to me and beat him down before he even touched the floor, it was a cheap kill in a way but it was perfectly valid, i wasn't using up the whole thing praying someone would run along and save me, so in other words, used in a strategic way it can be absolutely brilliant, but used by the wrong person and you could find yourself waiting till its used up before finishing the person off.