Like the title says, this movie sets the standard. Not only should "comic book" movies look up to this, all movies should.
"Dark Knight" transcends the genres of "comic book" and "superhero" movies to tell an engrossing story. Everything about this movie clicked. The acting all-around was incredible; it wasn't just Heath's performance (though I don't know if they could ever bring Joker back in a future film with Heath gone, he's that good). And all I can say about Chris Nolan; he's the man!
Long story short; go see this movie, and see it several times.