"I agree that Alfonso Cuaron is a good director, but he had taken too many liberties, and there was no character growth shown in the movie."
I don't agree that there was no character development. I pointed out above that Potter is angrier and more irritable (that's a change right off), that his concept and attitude towards Black changes throughout the film, that he develops a friendship with Lupin, and that towards the end, he cries out that nothing's been achieved. That level of bitter awareness and disillusionment is something he did not have at the end of the previous Potty movies. In fact, I'd go so far as to say this is the only Potter movie to have any character development--at least any that's believable, or even moving.