I didn't really count the setup/origin against the movie because, like you said, all the comic book movies do it. I've just come to expect it in a first movie, and GL has a lot of setup to do. I thought they handled it fairly well myself. Could it have been better, yes, but hindsight is 20/20 and I'm just pleased to see a non-Superman or Batman movie from DC. I expect that the sequel will be better now that all of the basic story elements are in place. GL did jump around a bit, but I didn't think it did so to the point of being a distraction, or not being able to follow it. It's a fun action movie. As long as you're not looking for something deeper than that, I think you'll enjoy it.

-Eric