Welcome to the club Christian.
As for your question, I have to try instead give some input only from the perspective of someone who still thinks that java is a variety of ham (http://javascriptisnotjava.com/) . Basically you are searching for a quality metric when I read your question - so you are probably asking something along these lines? Feedback about QA metrics. Which ones would you add/remove? - #11 by vitalysharovatov
I know you are looking for a number, but all quality is relative to value, and the value is the real metric to watch.