One issue I've been encountering on my mastermind lately seems to take "pets are dumb as a post" to a new level. I set them to Follow/Defensive for the bodyguard bonus, and they take upwards of 15 second to register that I'm being attacked -- if they ever register it at all. And of course, if I tell them manually to attack, I lose the bodyguard benefits.
I'd also like Defensive to trigger "pets attack stuff" behavior if a nearby party member is being attacked, not just me, but that's less of an issue at the moment than "how do i shot laser".