[_RPM]

I've done a little bit of research on the team that implemented this and they are mostly PhD's. I was never that strong of academic outside of my CS classes. I just didn't care about anything but CS, and spent more time programming than I probably should have in my undergraduate years. Years later I suffer the consequence of that by having a lower GPA than most grad students would.

[Cthulhu_]

GPA is just a number, and a snapshot taken at a certain (early) time in your life and development at that. The PhD's most likely have at least 10 more years of experience than you, and their achievement - the research you read - is again only a snapshot of their life and level at that point in time.

The impostor syndrome (which you seem to exhibit signals of) is mainly caused by only seeing the higher steps, and forgetting the steps you've already taken.

[Ar-Curunir]

Isn't that pretty much all you need to be good at for a PhD in CS? Well that and writing papers.