Saw this today and...
Best movie of 2011. Easily. I can't get over how such a complex story was told with such a deft hand. So much of the storytelling is visual.
The performances, my god. I completely forgot I was watching Oldman. Cumberbatch was phenomenal, as were Mark Strong and Tom Hardy.
As a straight adaptation of the book, no, it's not better than the miniseries. But as a living, breathing motion picture, it's far superior. The acting, the cinematography, the score, it's just pure cinema. It's based on a book largely about people talking in various rooms for two hours and it's somehow pure cinema. And it brings out the heart of the novel that was buried under all the gloom and misery; that final montage was just fucking beautiful.
Yeah, it helps to have read the book but EVERYONE should read the book. Hell, it's such a cultural fixture that if you were at all interested in crime or espionage you should have already read the damned thing.