I'm not sure you're giving the movie enough credit. Remember, this is an American Action Movie -- it belongs in the same sentence as Batman & Robin, BZP Lovers, GI Joe: Rise of the Cobra, and Transformers 2. However, I'm sure you can agree that TDK is not on the caliber of those movies. It went above and beyond what a normal action movie goes for, and it certainly deserves praise for that.
Also, it must be noted that most people can't tell the difference between superb acting and mediocre acting (I certainly can't). When Christian Bale appeared on the big screen, I saw him as Bruce Wayne (attempting to be Batman, but still I think he did a good job with being Wayne). Same for Michael Caine (though I'll admit I've seen very little -- if any -- of his other movies). Many people also don't really have the cinematic know-hows to realize the merits (or demerits) of certain aspects of film. You're better able to analyze it when you know the craft better. This applied to me when I first got into music. For example, Hip-Hop was once my favorite genre. It had awesome rhythms, and the way MCs could fit their lyrics to the beat was unbelievable. Then, I started getting into music, picking up the Trombone and learning practically all there was to know about Jazz and Classical. I also started composing my own music, all of which led me to have a much sharper ear. Now, these same hip hop songs sound terrible to me because I can hear many things that I simply didn't notice before. It's the same thing with movies. I did not see what you saw when you watched the movie. I saw an epic encounter between Batman and the creepy Joker.
Is this a problem? For some, maybe, but not for me. My attention is focused on technology, and I also have an enhanced ear for music. I can do what many can't and type letters into a console and create what people in the past have paid money for someone else to make for them. I'm not a movie person, but I am a music guy and a programmer, which are skills by themselves.
Also, you're in a music video?! That is something to make ten blog entries about!