He is by people with any sense. He’s superb.
I’d never noticed him doing damage when the skill was re-cast so I was merrily assuming it doesn’t. I use him for heals and HP boost; the rest of the skill is just a nice bonus (and sometimes clutch, to be fair). Fortunately I didn’t have to chase him as he came my way anyway - three times! I’ve maxed two. The overheal comes in more than handy in NT, in particular.