Well, I finally saw it.
That was pretty shameful. Usually, when a movie is going to be a mess, the trailers give it a way--usually you can tell, because it often goes hand and hand with disregarding the source material. In this case, they tricked me. They observed the material, but they just ended up doing a really weak, lame job of it.
Weak effects, weak characters, weak plot, weak scripting, weak action--the whole deal. They just saturated the whole thing with lameness. I walked away from a Green Lantern movie thinking that Hal hadn't done a single cool or interesting thing with his ring, and that sucks.
Additionally, those areas where the source material did deviate were all for the worse, not the better. Parallax as a rogue Guardian was lame, the forging of the yellow ring that never got used didn't make any damn sense (fight fear with fear? What?), and then Hal asks the Guardians for permission to go back to his own sector and do his job? What? I imagine what was supposed to happen was that Hal would enlist the helpt of the Corps to fight parallax--but then they realized they couldn't afford it, so the scene was rewritten into the nonsensical pile of crap it turned out as.
Furthermore, Sinestro putting on the ring at the end came out of nowhere, since the darker side of his character was never established.
Hector Hammond was also lame (are you sensing a theme of lameness yet?), and was basically an engine for laughable scenes and action sequences.
The movie wasn't Catwoman bad, it wasn't Batman & Robin bad. In fact, it was nowhere near that bad. Instead, it was simply Punisher-bad--it tried to do everything right, it had it's heart in the right place, but it just failed to reach the level it needed to reach. It was just too lame. I can't believe they made an honest, true-to-the-source Green lantern movie, and it turned out lame. How do you even accomplish that?
Maybe they can recover, though. First Class raised X-Men from the dead, so maybe with a sequel they can finally take this one all the way. I just hope that the lameness of this movie doesn't hurt GL's chances of making it to the screen in a superior form somewhere down the line--and the same goes for the Flash and the rest of DC's stable.