Deardorffs were used in many commercial studios for years and were great workhorses. They were durable, reliable, and easy to work with. I would guess more commercial photography was done on a deardorff than any other large format camera.
They were in every commercial studio I worked in, as well as my college (RIT). I think they got the reputation because they were so popular in the professional market at the time. There are lot's of other excellent cameras out there though. I got my deardorff used 30 years ago, when I was 17, and shot many thousands of sheets with it over the years, with little more than a new bellows a few years ago. It's a great camera, though there are lots of other great manufacturers as well.