The New York Times says
Pitchfork has emerged as one of the more important indie taste-makers in any medium, with 125,000 unique visitors a day and only three full time employees.
The critical writing about the music is compared to the legendary Lester Bangs and Greil Marcus. Bands that have struggled for years once picked up by pitchfork have often witnessed a rapid increase in sales and their music.
Summing up the New York Times says
The web is a place where (a) tribe is built and serviced by likeminded folks who thrive on the insiderness of it all. There is a common language, common values and a belief that whatever obsession is being serviced it is the right one to have.