I just use it for dmg and dont even try or care to use it for the heal. Waste of time to save it and hope for the right moment.

They should increase the dmg from it however to make it actually good. I would say easily change the heal off of it since that is just stupid and make it a nice 500 potency attack.
I have yet to see a time on any mob or boss where you can use it more than twice, probably 95% of the time it is a single use ability, so it is not overpowered by any means.
Also it is a shared skill with melee dps so it should be useful to them rather than some stupid fluff that they can choose to simply ignore.