Yeah, I'm not a big fan of Green Lantern either. My first exposure to him was in the Superman: The Animated Series episode that introduced Kyle Raynor (comic artist) as a new Green Lantern, and I enjoyed the episode and thought his powers were cool. However, the more and more stories that focused on the enigmatic "Green Lantern Corps" out in the cosmos, the less I liked the character. Once these comic stories leave the Earth, they have a lot of trouble making me
care about the fate of random people on random planets I don't know. Plus, it's hard to see the Green Lantern as "special" when there are hundreds of thousands of other individuals in the universe with the
exact same powers.
That's why I had a lot of problems with how the Green Lantern Corps were used in this movie. I can enjoy a story where there's only one Green Lantern of interest and he's protecting Earth, but don't show so much of the Corps if you have no intention of using it. Pick one or the other if you're going to do a Green Lantern story, because otherwise it just demeans the character.
As for the effects, maybe it's just my years upon years of watching animated TV shows and movies, but they really didn't bother me. I've seen far worse CG and live-action integration than this. Try watching Gundam G-Savior sometime. Hell, thanks to
Linkara and Nash, I've seen far worse Green Lantern CG and live-action integration than this. And since Ryan Renold's face is usually the only "real" asset in any given scene Green Lantern's in, my suspension of disbelief wasn't broken more than a couple of times. It was just CG characters talking and interacting with CG characters in a CG world. The scenes I had major issues with were usually ones where the camera did a close-up on Hal's face, where you could see those
horrible CG eyes behind the Green Lantern mask.
As for Parallax, I know this is going to sound blasphemous but I was fine with the whole "evil cloud" concept, just as I was for Galactus in the 2nd Fantastic Four movie. I'm sorry, but
THIS is not intimidating, and I'm not sure a
giant yellow tick would look all that threatening on the big screen either. A storm cloud is formless and impenetrable. It represents a powerful force of nature, and it gives the impression that somewhere within that cloud is an evil whose appearance is up to the imagination of the viewer. Do I think that either movie really delivered on that idea? No, but I can see what they were driving at.