Just adapt to the situation then. If they use armor lock, then use the same ability to counter against it. Rather than waste your time complaining about it, develop strategies against it that will give you the upper hand. It seems that most people who complain about armor lock, usually don't have a buddy to back them up in a firefight when they do run into a player who locks up. This is easily solved by not playing by yourself. The game is much more fun when you play with a party of friends working as a unit.
On a side note, in a match of BTB Slayer, some guy had armor lock for his "tool of destruction (5 kills)." Never seen that before, but I thought it was hilarious.