I don't think that Time Out review is as bad as people are making it sound.
The reviewer doesn't like the Earth scenes, the human drama, and wanted to see more of the GL action in space.
I wouldn't be surprised if the Earth stuff isn't as exciting, or the human drama element doesn't work as well. That could be something that needs to be worked on for a sequel, or we may be done with that and it goes straight into the space stuff with Sinestro and Carol/Star Sapphire the next time.
I wouldn't be surprised if the Carol Ferris character isn't very drawn out in the movie, and if Hector Hammond is considered too odd to those unfamiliar with the comics. As a fan, I'll probably enjoy those aspects more.
I am not expecting the drama to be as successful as what Nolan did with Batman, because he really took all that very seriously and focused on that. GL has a lot to do and certain aspects may be given short shrift.