You call water ball a stun l0l, bd only has ham (rush doesn't always stun) and counter, actually I've raped many bds on my casters, kiting is easy, I didn't even have to heal on my healers, and about druid, it "might" be op since my un-geared lvl 14 druid raped a +10 bd in the arena (dat was a full hp 1VS1), druid is the same as the other healers, if you kite perfectly you'll surely win (if you combo ranged attackers well you'll win too)
Note: You can kite ranged attackers too