A full and meaningful life is sitting above and beyond a lot of pleasure. I wouldn't say somebody left a good life if they prayed upon people and were selfish and cruel. For some people living a life that has a spiritual or transcendent value, it's more important than happiness.
Do psychologists know anything? Psychologist Paul Bloom says yes--but not the things that you might think. Bloom discusses his book Psych with EconTalk's Russ Roberts and what the field of psychology can teach us about human intelligence, consciousness, and unhelpful instincts. They also discuss just how far psychology is from a true understanding of the human mind, and why, according to Bloom, that might not be such a bad thing.