I would love to see Harry on the big screen, but I do not think it would be to the book standard. A lot of people point to the Harry Potter series as an example of a book to movie adaptation that was done well (for the most part). However, that was a unique example as the main actors were able to age with the movies. A direct book to screen adaptation would be hard due to the large number of books. More likely than not, if they wanted to adapt the current storyline, they would cut books out entirely or combine books together in one film. Alternatively, they could create brand new stories for Dresden and set it in an "alternate universe" to the main stories (my preferred method). I would also love to see an animated Dresden ala The Last Airbender.
I like the way they're adapting the Series of Unfortunate Events books on Netflix. Two episodes per book, eight episodes per season. It could be done similarly with Dresden. Maybe two episodes per book, with three episodes as a finale per season; Summer Knight deserves three episodes, for instance. So would Proven Guilty.
However, I'd like them to wait for Jim to get back to a more regular publishing schedule first, because I'd prefer that the books finish before the series outpaces it. I don't want another Game of Thrones.
There are a fair few films of books that manage to be better than the books because the films are quite good and the books were terrible; Angel Heart and The Hunger spring to mind.
And there are unique examples like The Princess Bride and 2001 where through various combinations of genius in both media the books and films are both brilliant and different in ways that make it kind of impossible to judge.
Yeah. I liked a very few movies better than the books: I Am Number Four, Secret Window, Stand By Me (mostly), Psycho, the Godfather, Jaws, Fight Club (which I found tedious to read), and No Country for Old Men (because punctuation matters, damn it, no matter what they say about style). I hate what they did to Harry Potter after the third movie, and I usually walk out of the theater pissed that they messed with a perfectly good story.