The guy did a very very good job with Sherlock Holmes. As someone who has read all the newspaper shorts and the novels, and keeps the full collection in my bathroom for light reading, the easter eggs in both those moves that tied right into the stories was awesome. Doyle and Poe are 2 of my very favorite authors of all time.
I must say I agree that Sherlock Holmes is a very well written film, and I don't doubt in his abilities. Its just Star Wars is a very delicate world, and knowledge of it definitely helps you navigate.