Why has the movie "The Green Lantern received such terrible reviews?

They said is was over produced and the story wasn't didn't follow it's
original Comic Book lore. Ryan Reynold's pulled the character off
brilliantly, and the love story and it's tension between him and Blake
Lively was very believable. Superman, Batman ALL followed different
directions as the several variations of the movies unfolded to EVERY
ONE'S delight, what have I missed here?