Characters- I had questions about the casting going in to this. I felt that Ryan Reynolds would have been better suited to a Kyle Raynor GL than a Hal Jordan. He stepped up and it was pretty good. You got to see Hal grow into the ring somewhat. Hector Hammond was spot on, Sinestro had the look but the voice was distracting. It was just way different than the superfriends voice that still gets used in my head when I read a GL comic. Blake Lively is still the big question mark. She wasn't bad, but I wasn't reading CEO and pilot. One of my favorite character parts was watching Hal as he learns to fly with the ring. The character is a pilot and flight without a plane should truly delight a pilot and Reynolds was able to capture that.
Plot- This is really where the movie didn't quite measure up. It was like they wanted to tell too much story. Earlier I mentioned that Hal grows into the ring with the somewhat identifier. I hate to say it but a montage of heroics may have been in order. My biggest problem was with the pacing. Every writing class I have ever heard of tells their students to show and not tell. In movies, this should be much easier because it is a visual format. Green Lantern tells a lot. The movie is full of exposition. GL has a very dense history with lots of little intrigues and twists, especially since John's run on the book. But you can't just explain all that in the movie, it should be shown or revealed over the course of the series. My wife didn't get all of that and was pretty confused about the guardians and Sinestro.
I can hear people now. You think you could right a better screen play. Why yes I do. My story would have centered on Hammond as the only villian, not had Abin Sur's back story, probably would have had more training on OA and might have hinted at Paralax for a sequel.
Overall- It was an entertaining movie. Having a back ground education in Green Lantern comics helped me with the exposition but irked me when they tweaked things. I left the theater happy, but left thinking Earth was the only planet with life or problems in sector 2814. Some parts may be scary for younger children, but the movie was pretty family friendly.