While I agree Dance (and Feast) are good, I don't understand why people trash the editor to this day. Martin's editor isn't bad...the problem is that Martin does not listen to his editor. The Dance manuscript used to be displayed at Texas A&M's library, and it's full of editing notes that were ignored; Google it, there's a big reddit thread about it with pictures. She dings him on the nonstop "words are wind" phrase, suggests certain chapters be reduced, etc. Much of the advice wasn't taken.
On the flip side she did convince him to remove the two battles from Dance. According to her there wasn't enough space in the manuscript to include those additional 200 or so pages, and revising the book to include them would have taken a year or more.