Completed this on Hard Mode with 2 Commandos (DPS), a Scoundrel (heal), and a Guardian (tank, duh). The fight was very easy. He even enraged for the last 6 or 7% and no one died. The smash doesn't even do a lot of damage to the tank. The first two times his shields were up we used that time to regen. Before the third time we killed some of the droids and only one of this shields went up, and he enraged shortly after we broke the shield. But the healing was manageable and I only had help with 1 heal from one of the Commandos. We were all quite surprised how easy it was because some of our group tried doing it on normal and it was ridiculous damage. I think it's just NJormal mode that need to be toned down.