Auto Armor should help noobs learn to use the suit and only in the beginning, instead it just makes harder for the rest of the players to kill them and teaches them nothing, so the execution of the idea is terrible.
For example it might have served if it only activated for a short period of time (two seconds or less for example) after which the player would have to press Q to prevent Armor Mode from being turned off, that way you can train noobs to have quicker reflexes and activate Armor as soon as they are attacked and also before entering combat.