Eh. Honestly I think its kind of lame that Batgirl was never Oracle. I always liked that. Overall, although I like the New 52. I'd say that my main complaint is that there is no clear picture of how much of the old DC continuity still happened. We've seen references to everything from Blackest Night and Brightest Day to Death of Superman, Death in the Family, Final Crisis, Wolfman/Perez New Teen Titans, etc. Some of which is contradicted by other titles. DC just needs to get in a room and decide what they're keeping and what they're chucking. I honestly think it'd be great if there was a time jump after Trinity War, which would provide for a time period for some of those stories to take place, and then if DC stated that some of the New 52 titles took place after that time jump...Its an idea.
Batgirl #0 showed that Barbara was never Oracle. Bruce was only gone for 4 years, not 10. Batman and Green Lantern were only operating for 1 year before the Justice League formed. Superman was there for only 6 months. Flash was only around for a couple months. Aquaman had never come up from Atlantis besides during his Others missions. And Wonder Woman and Cyborg started their careers during the Justice League formation.
DC has already explained all of this.
But, hey, I would rather have consistent titles without the old continuity than making everything confusing in order to pander to old fans.