Mine occasionally suggests specific elements*, but mostly she describes what doesn't work for her. Whether I change them or not is entirely up to me. (In an early draft, she thought a character should've been removed entirely, because he wasn't in enough to really flesh the story out. I added him in even more, because I felt he was necessary for my heroine).
*She did that just this week, in fact. She asked what I thought about changing the spelling of a character's name. Since I'd referred to that character in casual chat with that spelling, the only reason I didn't do it before was because I thought it would be wrong in an editor's eyes (it's a hacker spelling of a hacker's handle, and it's completely appropriate for that character and my genre).