Or to take a statitic look, 2 out of 3 forks on github are empty[1]. The quality per "project" on github is order of magnitude less than on debian.
You can test this out by randomly picking github repositories and read code. It takes several tries on the randomizer to even get code, and then even more to get code that actually do something.
Using statistics from more mature projects will provide different results than code just thrown at the wall.
As for the beer, it is a bit of a fringe view to allow others assault oneself with beer bottles. Most people will expect physical assault to have legal repercussions. The GPL in the same way trust that most people will not go out to hurt others, but in the case they will, repercussion will happen.
I now really hope you never end up in a court, complaining about assault, and having your comment above used as evidence against you. You basically gave everyone a license to hit you with beer bottles.
[1] http://blog.ram.rachum.com/post/4472104984/2-out-of-3-github...