Aside from the constructive criticism, it might help usability is you made your algorithm more transparent so users could see why they are essentially irrelevant (if they expected otherwise) and why some others are getting what appears to be arbitrarily high rankings. But, I do like this idea, and it would certainly benefit me if you found a way to make it universally indicative of a coder's skill. But that's hard. 1. It's still hard to tell without sitting a hacker down and testing them, 2. popularity does affect page rank. Some highly useful repositories are lost in a sea of absolutely useless, but popular programming playthings.