Just saw it not knowing exactly what to expect, and man was it awesome.
It's the film equivalent of using every part of a small, meaty, badass buffalo: everything serves a purpose, nothing is wasted. It didn't try to go beyond what it set out to do or needed to do.
Tom Hardy did exactly what needed to be done, no more no less, using the perfect balance of unintelligible mumbling and actual dialogue along with great facial expressions and ticks.
Charlize Theron was just a complete super-badass, owning that character the whole way. My favorite part of the movie.
Go see it if you haven't. Everything was amazing, already want to see it again. Also want to find a large print of this poster: