No, you need power weapons - but they are earnt by getting to the spawn first or killing the user (or if you're lucky you'll stumble across one).
The thing with armor abilities is that it makes the game unpredictable which makes it harder to play well - for example if a guy has a rocket launcher or sniper you normally have visual/audio warning of it - however with things like armor lock you can stick a guy or be about to successfully splatter him with a vehicle only for him to lock and completely negate your advantage (got by skill) in this situation.
Armor lock is terrible mainly because it slows down the gameplay so much (especially when you have a whole team doing synchronised armor lock BS in that room on Sword Base).
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Armor Lock is very simple to counter… But you don't find how so you're bashing it!
So you're only drive by your frustration to don't have the kill you think it easy.
You can find the same type of bashing for all the AA in Reach, course "It's cheating, I come to slay a guy , and it's start to run, it's so cheating!! It's slow down the gameplay, 'cause I'm don't have the kill!", Jet-pack "The guys used it are so damn cheaters, they always leave the fight, slow down the gameplay", etc…
Try to change you fight style, it's the good way more than complain for peanuts. And I'm not a high profil player in Reach, don't have time to train. And personally "Duck" Spartan are more "frustrating" than "Statue" Spartans, one can move everywhere, the other is a very easy kill. And in fight moving is the win.
@Dragonelite: Power weapons are the easy way to win, the guy who got them and use them correctly got the more kill on all the maps. But we're accept this 'cause they here from the start, and we hope we got them to be "God" one time.
Try Armor Lock is very instructive to look and heard the reaction of players, always the same in 90% case, gamers are so predictable sometime.
And to be fair, I'm use Run AA in 65%, AL 20%, Stealth 10%, And others 5%.