Protection and empathy ... two skills that an engineer should Max out, but I've seen to many people who only put a few points into them. Some don't even have protection. I only put one point into the personal energy shield because with one hit its gone. Useless. So I'd rather buff up my armor by 60 points for two minutes. Also Max empathy does 88-96 health points during Max heals. Sometimes less, but it does put up big numbers. And one more thing, if you don't have revive don't play an engineer!