I just pulled Sentinel today, which is great because I've been in need of a tank. He provokes fairly often, and he's tanky enough to take hits. He can also debuff attack and healing effectiveness. His real kicker, I think, is his passive healing of 10% per turn start. This means I can pay less attention to his health when choosing which ally to heal.

With all this on his belt, would he make a good tank? Or should I keep looking?