It's not bad, but not good either.
The good things:
The gameplay is good, I found some parts are similar to god of war but is enjoyable, it has good graphics, you can choose which technique you like the ring, either a hammer, a machine gun, or even an armor or a plane, the story is good but not memorable.
The bad things:
Combat is repetitive, flying missions are very easy, it's short, it takes 5 hours to complete the game, after finish the story and get all the improvements of the ring it gets boring so fast, becuase the campaing is the only thing that it has, it lacks extras or challenges.
I just rent it, but if you are green lantern fan, you will probably love this, this game is neither the best nor the worst, just could be better.
6.5 of 10.