What's the verdict on Auto Sentry?

I’ve heard that it’s a useless Armor Ability, but after messing around with it in campaign today i think there’s some use for it.

How long does it need to see an enemy before it starts firing?

I can see how it would be useful in Campaign or Spartan Ops (for just taking down grunts and whatnot) but in War Games I don’t think it’s going to be so useful.

Yeah it’s useful in campaign when you’re backed into a corner and need some momentary support, but in war games, it’s pretty useless.

i gave it a damn good try in wargames. i think it gives a small amount of stress to players but its about useless imo