What does "fault" have to do with anything? You people need to get over this "Chris Nolan created Batman" delusion you have. Nolan did not utilize Ra's Al Ghul to his full potential in BATMAN BEGINE (I.E, he relied on the "twist" aspect of his Ra's Al Ghul portrayal, and he forgot to include Talia). I have no problem with another director building on what Nolan did and including Talia in the mythology. It provides a connection to the Batman franchise without stepping all over it.
Again, the only way I would understand Nolan being pissed (and we don't know if he is or not) is if he planned some enormous crossover Batman 3 involving Ra's Al Ghul, The Joker, Two-Face, etc. But I imagine he would have said something to WB if that was the case, don't you?