Interesting question.

I've noticed some of the art that bothers people is from titles with multiple pencillers. It makes sense that one artist's style can clash with another's and that will be offputting. If you don't care for an artist, you're also less likely to pick up a title that is just their work. I do recall not caring for some of the artists on Sandman.

In the other direction, it would probably be artists who worked with Jeph Loeb who weren't Tim Sale. I generally liked Loeb when he was working with Sale, but not when he's working with McGuiness, or other artists I generally like.