I recently re-read it and didn't find it dated. I suppose if you've taken in its lessons, then it over-emphasises its point a bit, but consider that (as Pinker points out) "its main point still needs to be made 40+ years later. Most journalists, psychologists, and intellectuals commenting on natural selection still write as if it acts for the good of the group or the species, without even realizing they have said anything problematic or contentious."

Also, the stuff on evolutionary stable strategies is very insightful and lucidly explained.