Yes and no, I'd say it something that really depends on the situation.
Machinery can malfunction, but then again, so do people.
I think many situations would require more discretion than just attack everything that's not yours.
What about security? They'd be a pretty big target for anyone I'd imagine. but then the human lives.
Eh, I'd say no.
At the most, I'd say I'd accept them most as supplementing human/thinking troops.
For now.