I found that sometimes killing an enemy would take a few too many bullets then I would expect, often more then half a magazine would be needed to defeat an enemy which may have something to do with the armour but I found that once an enemy had shot and killed me then the armour deployed so in general im not so sure the armour is a usefull addition to the game but maybe could serve some purpose as a perk rather then a action that can be performed throughout.
Finally the grenade system must be improved, multiplayer is a fast paced environment so having to press one button to pull out a grenade and then another to throw slows down the process which results in alot less grenades being used compared to the games competitor.
Thank You