i wouldn't exactly let a healer companion pull first, but yeah.
Doc is useless to me... I spent 300k gearing him up, took him out to use as a healer did the whole setup as healer business and when I had more than 3 guys attacking me at once, he just couldn't keep up with the healing. I'm better off with a tank or dps that can kill the enemy before it has a chance to kill me. If it's dead I don't need to worry about healing from the damage it causes. *grin*
But I'm with a Guardian DPS, your results may vary by playstyle.