I never played a DRG in XI, so I don't know how the pet AI was.

The pet classes in WoW really irked me. I hated having to control them when they would aggro or attack mobs I didn't want them to. I ended up having to put them on passive and macro them to my abilities.

The companion AI in SW:ToR was better but I'd still have the random occasion where they would run off on their own or attack the wrong mob.

Having to manage yourself in the heat of battle can be tricky enough, throwing a pet into the mix isn't something some people can do easily.

"Oh, hey sorry guys. I didn't mean to pull the boss. Stupid pet..."