@zandoz: The song has nothing in common with portal's song... If you mean that this song has surpassed all limits on The best credits song in the world, then it's not the developer's fault ;)
Seriously, i don't care about badges. I care more about the fact that when the green guy sees you he passes by like he was a friend instead of screaming something like 'ASSASIN!' or 'THEY'RE TRYING TO KILL ME!'
4/5.