Saw it this afternoon and was just going to come give my thoughts, but I think they echo Jeff's pretty much exactly. I can understand why reviewers and some others may not be crazy about it, but I enjoyed it as well. I also thought we could have used more of Oa, the other Lanterns, and maybe a little more action. It was a bit slow in places, but you tend to see that in a lot of origin movies due to the "setting up". As we left the theater, I actually told my wife exactly what Jeff was mentioning - if they do a sequel (and I really hope they do), I bet it will be even better. If they can get more into the Hal/Sinestro dynamic (one of the strongest points of this movie, however brief it was) and make an all out action movie now that the origin is out of the way, I think they could make a heck of a movie.
One other thing...at least in our theater today, Hector Hammond's character seemed to be getting laughed at (and not in a good way). A lot of the reviews I've seen have really skewered that character, and I can kind of see that. It didn't bother me as much as others, but once he went through his transformation a bit a lot of people were just laughing at his appearance. Again, like Jeff said, I think if you are familiar with GL you'll get more out of the movie than the "general audience". Really hope it does well enough to warrant a sequel. I think it will have a good weekend, but we'll see how it holds up.