You people are too picky. This movie rocked, and it was a blast in the theater. And really, if you were to look at all the superhero movies made in the 2000s alone (just for simplicity's sake), Green Lantern is probably one of the best superhero movies ever made.
Here's a list of everything that's come out in the 2000's:
Movies I have in green are the ones I think were fantastic.
Movies I have in red are the ones I think were just okay.
Movies I have in blue are the ones I think are flat out crap.
X-Men
X2: X-Men United
X-Men: First Class
Spider-Man
Spider-Man 2
Batman Begins
The Dark Knight
Iron Man
Hellboy
Hellboy II: The Golden Army
Unbreakable
Thor
Watchmen
Superman Returns
Iron Man 2
The Punisher
Hulk
The Incredible Hulk
Blade II
Hancock
Kick-Ass
The Green Hornet
X-Men: The Last Stand
X-Men Origins: Wolverine
Spider-Man 3
Fantastic Four
Fantastic Four: Rise of the Silver Surfer
Punisher: War Zone
Blade: Trinity
Daredevil
Elektra
The League of Extraordinary Gentlemen
Catwoman
Ghost Rider
Jonah Hex
The Spirit
Now, I ask you. Does Green Lantern really deserve to be in the Blue group? Absolutely NOT.
While most people would probably agree that it ranks in the red group of being "just okay" like Iron Man 2 and Superman Returns, I argue that it belongs among the green group. But that's just me.
Green Lantern is CERTAINLY better than MOST of what Marvel has to offer.