Yup, this was it for me, GitHub was actually pleasant to use, to browse, PRs were easy, branching was easy, PRs with reviews/comments/etc were a brand new concept, especially as SourceForge and Google Code were hosted only on SVN which constantly fucked up/corrupted data in my experience

The closest thing to PRs that I knew was reviewboard, and that was a bolt on to SVN, not an actual proper integration