I'm just using "Year One" to point out that that's not the case at all. I don't need to be handed a step-by-step manual on "How to Be Batman" to enjoy watching Batman kick ass, drive a fast car, look like a bat and protect a metropolitian city.
Except that in the case of Begins, that was the whole point of the movie. Show how he came to be and "where he got these wonderful toys"... Nolan made it clear so many times. Of course you're free not to like that, all I'm saying is: that was the point.