One of the things I really liked about Breaking Dawn was the ending section, after Bella becomes a vampire. I've understood that Bella's unique affinity for vampire life and her special power have become a source of criticism for some readers, who believe her ease in adjusting to vampire life was too "pat" and made for less drama then they wanted from the end of the saga.
I have to say, the main thing I loved about Breaking Dawn was the transformation of Bella. I think her strength and power was foreshadowed throughout the series, so I have no problem with her being an amazingly strong shield. I also didn't have a problem with her self-control; she was the only one of all of them who was prepared for her life as a vampire beforehand, so she was able to temper her natural instincts with thought.
I think Bella was always destined to become a vampire. Edward was 100% wrong: he wasn't some aberration who showed up and ruined her life, he was the one who was destined to bring her into the life she was always meant for.
I'm interested to see what others think.