Yeah, that's pretty much what I heard today at the comic shop. When I got there, a couple of the guys were arguing about it with the shopkeeper, in a "comic nerd rant" kind of way, and I ended up browsing my way through the books to see what the fuss was about while listening in. Batman #0 establishes Bruce becoming full-fledged Batman between five and six years ago according to New 52 timeline; but B&R #0 shows Damian being born an undisclosed number of years ago, then growing up naturally as an assassin prodigy until meeting Bruce during Morrison's run, which is now set at one-and-a-half years ago.
So Bruce became Batman less than six years ago, joined the Justice League five years ago, went through three Robins in three-and-a-half years, to say nothing of the Batgirl situation, and now Damian's been Robin for a year-and-a-half? Yeah. As I said, it's "comic nerd rant" fodder; one of the guys was desperately trying to work things out like he was going to get a No-Prize out of it.