I think some cinematographers should never ever get their hands on a digital camera. I'm talking about folks like Dante Spinotti, Dion Beebe, and Dean Semler. Those guys are phenomenal if they're working with film cameras, but a lot less so with digital. Semler's digital work on Click!, Date Night and Get Smart! was terrible. Beebe's work is mixed, especially for Miami Vice.
And don't get me started on Dante Spinotti's work on Public Enemies. It's like someone brought a camcorder and used it by mistake to shoot the movie with. It was just ugly and stuck out like a sore thumb. His work on Voyage of the Dawn Treader looked a lot better, but thanks to using the same camera for Public Enemies -- it still looked video-ish and grainy in spots.