The ability for the reader to identify with and immerse themselves inside the character.
Rorchach is a socially awkward loner with a broken relationship with the opposite sex, buried homosexual tendancies that confuse him. He's infuriated with the way the world is changing around him, but while clever, lacks the intelligence or compassion to do anything but behave belligerently while Anonymous.
You see where I am going here, right?
The writer intended for the reader to identify with Dan, the awkward nostalgic uber-nerd, which goes to show you that Moore no longer understands the comic book audience.
Once he realized this, he said fuck it and went with Fish Dicks.