Interesting thought. Try invoking the Blub paradox here[0]. Who knows who the best hackers are? In some sense, only the best hackers do. On the scale of hacking ability, you can only look down and truly understand what is beneath you. When you look up at people beyond your ability, you have no idea whether or not they are crackpots or 1337 haxors. So, for this website to be effective at all, the people judging and deciding the hackers need to be at the top of the hacking scale to offer any sort of guarantee as to the quality of the hackers listed.

Dipping into personal experience and anecdotes, I don't recognize the names of any of the people organizing the site. To me, this means that the site probably doesn't have the very best hackers running it and so cannot guarantee that they have some of the very best hackers on there. But, I suffer from the paradox/curse of Blub as well, so I have no idea if the people running this are skilled in their hacking abilities or whether it is just a few grad students who put something together last weekend.

[0] http://www.paulgraham.com/avg.html

N.B. This comment falls into the same pitfall that the original essay does in that it only considers the field in question to have one dimension. Hackers come in all shapes and colors just as programming languages do.