This is definitely my least favourite of the 5 Jane Austen books I've read so far. I found the story only slightly interesting and it seemed to take forever to get through, never the sign of a good read. I also found the ending a bit ridiculous and dumb.
There was never any sign that Mr Crawford wasn't entirely devoted to Fanny. It's ridiculous that all of a sudden he was throwing all that away to run away with a married woman whose affections he was toying with earlier in the story.
Also Fanny is a bit pathetic in being happy that Edmund, who mooned over Miss Crawford for so long and made Fanny listen to him, suddenly wants to marry her now that the object of his love is ruined in his eyes.