I'm not sure this is the case! In fact, I strongly suspect that its inability to display logs or diffs correctly has contributed to the widespread developer confusion with respect to Git, especially since there are many people out there who think, implicitly if not explicitly, that Git and Github are one and the same.
You know how a lot of people think merge commits (an important keystone in how easy Git makes it to read and write meaningful history) are inherently "confusing" or "messy", and try to avoid creating them? Well, if you look at them in Github's awful log interface, they sort of are! This doesn't seem like the fault of those developers, and it's not Git's fault, since it ships with powerful command-line and GUI tools for making sense of things.
