One bad thing about Rescue is when healers use it to force the tank in a direction as a hint they want a bigger pull. I've seen it happen a few times where the tank is new and wants to take their time, but the healer has other ideas so they run ahead and try to Rescue along the way only for the tank to just go back to where they were. The healer then leaving the duty straight after because clearly they were unhappy with the speed of progress. I'm all for trying to encourage the tank to pull more but it takes a couple of seconds to just type it rather than use Rescue as a controlling action.

Of course those situations don't happen very often, but definitely as some have mentioned there are lots of times when the action is super useful when you use it beneficially (not trolling).