It's not bad, however it doesn't include my contributions to open source projects just the repositories that are in-fact mine. If I was reviewing someone else's resume I'd want to see those things.
Exactly. Not to mention that it doesn't even include forked repositories in your profile.
For example, I've got commit rights to repositories living on other people's profiles, I use my company's Organization profile to publish open-source software and I use my personal profile only when I'm working on patches for others (fork -> push -> pull request -> delete)...
...and my resume generated using this tool is just rubbish.