I thought it was entertaining enough, i dont agree with the reviews.
I saw it at a matinee this past Sunday - and I always love it when I practically have the theater to myself and my wife.
Unfortunately there was a young couple with their five year old kid - and I wanted so badly to look over at them and say "really? I don't think this is the movie for him, perhaps Cars 2 in the next theater over?"
Of course I didn't because I knew they would get indignant. Of course, five lousy minutes into the movie, when Parallax has a run-in with those three aliens, the kid was screaming/crying 'cause the movie was scaring him. I looked over at them and they proceeded to grab their kid and leave.
It was an okay movie, not a bad movie, not an awesome movie - but definitely NOT a movie for kids under 8.
I found it kinda slow in a couple of parts, but towards the end it got pretty decent. I knew enough about the Green Lantern story and some of the other comics to not really be surprised about anything in the plot. I hope they give it a chance with a sequel, they definitely have a chance here to have a Superman 2/Star Trek 2 situation on their hands - the hero up against a really great foe.