Why did you like it more? I like the Dark Knight because it was about Batman being Batman and actually doing something besides becoming Batman.
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I prefer origin stories just for that reason.
Might be weird, but my fav part of every movie is the beginning, getting into the strange stuff. I just wrote in another thread about how I happen to enjoy the Night at the Museum movies. But as I was watching the second one, what I missed from the first was the slow build. The discoveries made by the main character. Not the mayhem and "coolness" of the exhibits coming to life, which is fun, but rather how the character makes that discovery. It's the same way I feel about disaster movies. I love the disaster part, but my fav bit is the calm before the storm, meeting the characters, watching their reactions to the news of imminent disaster, the warnings, the "you fools, you should have listened to me!", lol. When I re-watch "Independence Day" on tv, I tend to turn it off once they are all in the army bunker underground. I don't need to see them kick alien ass once I've seen them do it after a few viewings of the movie, I just want to watch them get to that point.
Same thing with Batman begins (and Star Trek), I like seeing a character learn, make mistakes, and then, at the end "become". That's why I love Star Trek (the latest film). The WHOLE movie is about bringing together what we know will eventually be the crew. It's the foreknowledge that these people are special, and then watching them discover it themselves that's awesome.
I love in Batman Begins when he's figuring out what works with his outfit and what doesn't. I love watching him acquire the Batmobile. I love his learning that Bruce Wayne is actually his alter ego, and the fun he has "playing" a selfish billionaire. And I love, LOVE, watching training montages.
Does that answer your question somewhat?
ETA: I also just love that moment when everything comes together. Like the end of Star Trek. He comes out onto the bridge, gives his best Shatner impression. We see all our beloved characters where they are supposed to be. We zoom out through the windows, we hear the classic music in its entirety for the first time, and then we hear "Space the final frontier . . ." Gives me chills every time. It's a combination of knowing, ie we know that in the end we are going to get this moment, and not knowing, ie watching HOW we get to that moment. When done well, when both come together at the end . . . magic.