When I read old philosophy, I often find myself criticizing it for a lack of understanding of who we are, where we come from, the basis for our morality etc. Modern biology and evolution explain so much of what they tried to explain back then.
Sorry if that sounds pretentious and all-knowing. It's not just me, though, I think that view is probably shared by at least 90% of people who study or work in modern evolutionary biology/ecology.