4.5 Stars for the movie that actually lived up to the expectations.
A four star for the story. The script was really strong, with great lines and conversations. But I missed some emotional depth in the story. The storyline felt at times like it was written by the Joker: focused on itself and chaotic. I can't stop noticing the strange plotholes and turns and twists. Like the fake death...and who came up with the idea of the sonar-mobile-vision and not to have a cool fight between Batman and the Joker adn directly implement the whole Two-Face story in half an hour...really it was a sort of anti-climax for me.
Heath Ledger is amazing indeed, although not really really great in the 'renewing' kind of sense. Put T-Bag from Prison Break (as example) some painting on his face and I think he could be just as great. The performance of Heath just are this high rated because of the tragic death and the right marketing campaign, promoting the Joker in the right way. I especially like the Hospital and the interrogation scene (ah, not to forget about the magic trick). The Joker's brilliance is a combination of acting and strong lines. Christian Bale was good, although his voice was terrible as Batman. The rest of the cast was great.
Nolan is definitly one of the best directors. The Dark Knight really is dark and the directing is great. I only missed the emotional part, it was cool, but it never made you fell sad (not even when one of the characters...you know who...died).
Awesome, nothing more to add.
Best summer blockbuster, maybe even the best movie from 2008.