Well, I just came back from watching Green Lantern with Sam and my bud Andy.
My first reaction to the Green Lantern film is mild confusion. I spoke with two rabid Green Lantern fans after the film (they loved it) and they seemed to have a lot of knowledge that filled in the gaps. Quite a few character relationships and actions left me scratching my head during the movie. I didn't even know the names of many of the characters and the one bad guy seemed to be totally unnecessary. Just too many characters, period.
Also, the movie just seemed LONG. It seemed to lack forward momentum in parts but perhaps this was compounded with my general confusion about who the characters were and why they did what they did.
We saw the movie in 3D and I've got to say that I had no problem with the 3D at all. Obviously this film was made with 3D in mind because it wasn't dark or blurry like Thor 3D was.
Bottom line: I think fans of the Green Lantern will love it but it will fail to impress general movie audiences. Is this the first film in the Justice League series? If so, I don't think they're off to a great start.