I'll get this out of the way, I loved this movie.
The scale of it all was (though the word has been ruined by overuse) epic, and every actor gave a believable performance, with special recognition given to Christian Bale, Michael Caine, and Anne Hathaway.
That being said, there were some definite issues. For the first forty five minutes or so the film progresses at an uncomfortably breakneck speed, not letting character introductions sink in long enough. The pacing stabilized after the first act, however.
As to the question of Bane's voice, it's really only a problem in the very first scene, where it was poorly mixed, and the accent seemed too posh. Again, this issue corrected itself once Bane arrived in Gotham.
However, I believe the good outweighs the bad. Bale gives his best performance of the trilogy, Tom Hardy is suitably menacing and devious as Bane, Michael Caine gives a highly emotional turn as Alfred, and Anne Hathaway absolutely steals the scenes she's in.
Add in various Mythology Gags
(including a possible nod to the Martian Manhunter, of all things) and the riveting score by Hans Zimmer, this is a fitting end to the Dark Knight Saga.