I don't think I've run a group yet that has been able to kill him outright at <62. He's OJ to 60, which means he'll crushing blow you quite a bit. If you have a healer helping, it's cake but without that you just can't heal your own guys fast enough to DPS him down. My locks got the closest out of any of 'em and they could only get him down to about 10-15% before they died, too. :P One 65+ tank or pet tank will get you through it, though.