Green Lantern: Emerald Knights, by Christopher Berkeley, Lauren Montgomery, Jay Oliva, was a complete disaster! I don't know if a curse was put on the Green Lantern, but almost every movie starring him has been an abomination.
Unlike other Warner Brothers animated movies which offer us a complex and thrilling plot, Emerald Knights examined back story, after back story, after back story for almost every character which not only bored me to death, but it exasperated all the time that could of been used to focus on the main plot. I understand some people don't know the back story of the Green Lanterns, but character development should not consume more than half of the movie especially when the back stories were thematically unoriginal and one dimensionally monotonous. Furthermore, having so many origin stories was incredibly distracting to the flow of the movie. As a TV show this concept would have been much more successful; however, such a theme is completely irresponsible in a movie due to the time restraints of a film.
If you examine every DC animated film, you'll notice that maybe 10- 15 minutes is given for a super heroes origins, than it focuses on the main idea which will drive the bus the rest of the way. An excellent example of this structure would be the animated movie Wonder Woman.
As much as I like Green Lantern's character, Emerald Knights was incredibly mundane and ultimately scattered. For this reason, I give it a 3.