Honestly, I feel Iron Man and TDK are equally good, except it's apples and oranges. If IM is a superhero comedy, then TDK is a superhero drama. Although let's face it, IM was unique in that it is the first of its kind, where as TDK, as well done as it was, is about the 6th or 7th feature length Batman film, and was nothing we hadn't seen before in a bunch of other films.
And while not as good as those two, I thought TIH was pretty damn good and entertaining for a Hulk fan like myself.