Re: Ambiguous headline
No, most code on GitHub is rubbish. Just like SourceForge before it, and countless other open repositories.
It's not all rubbish, obviously, but let's be honest there's a lot of shit out there written by people who simply don't know what they're doing half the time. Mostly due to lack of experience as much as anything else - which highlights another point - GitHub is where hobby developers dump their stuff because they heard backups are teh cool, bro.