Batman Begins is my favorite of the nolan trilogy. I think it set the right tone. The Dark Night did not have that tone...it was too serious. The Dark Knight Rises did move back to that tone more.
I have an appreciation for Nolan's Batman movies but I have to say that, for me, they are too serious. Yes, Batman is a Dark charcter but I think Nolan went too dark and serious. Even though I have been a DC comics fan all of my life, I think the Marvel Movies really set the right tone for superhero movies.
At the end of the day superhero movies need to have some fun and have some fantasy elements to them. The Nolan movies, while engaging and exciting, they lacked some fun.