I can see where you guys are coming from as well. Like everyone else, I really enjoyed the Dark Knight - but I didn't quite get that it was the "end all be all" of movies ever that some people seem to feel it is. Its a great movie, with a wonderful cast and its well acted...and I think all the acclaim Ledger's performance has gotten is well deserved. There's nothing that I really disliked about it at all, but I thought Iron Man was every bit as good. Granted, totally different movies, but in their own way I thought both were great. Iron Man is a little more fun escapism, where Batman is more realistic in tone, and is quite dark. I think we discussed this here around the time of release, but I didn't like all the comments were basically every superhero franchise has to do it "like the Dark Knight" in reference to the gritty-ness, realism, etc. It works perfectly for Batman, but it doesn't work for every hero. Someone like Daredevil, maybe, but the likes of Spidey, Superman, Green Lantern, or others - not so much.
Something I really like about the Batman characters is there have been so many different interpretations of how to portray the character, and I've liked many of them. Begins and TDK are great movies that I really enjoy, but I still think the Animated Series version is my favorite Batman of all time. Just the right mix of realism and brooding without being quite so overly dark. Anyways, Dark Knight, still a great movie

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