... None stick to their source material but the final version works well.
Honestly, I get pretty hardcore-
meh about a new DF adaptation onto the screen, as soon as I envision it
not being relatively faithful to the printed "canon."
The stuff we learn from novel to novel, the gradual increase in scope and scale and risk and stakes... all of this is part of what I enjoy in the Dresdenverse.
Something I don't need maintained: each novel covers a very short time, typically a few days, with a year of downtime between. Instead, I would envision the various books' plotlines being a bit more intertwined, so by the time "plotline A" is mostly resolved, we're launched into "plotline B," with some forshadowing & hints forward to C & D & even later. Add in the shorts, the graphic novels -- maybe even some of the microfictions! -- to round things out.