I enjoyed the movie and I was a great idea to make a different approach to the great flood story. Kind of reminded me of Troy movie with Brad Pitt. Things similar to the events in the actual story do happen but not in exactly the same way.
But I think it was a bit shallow for a movie that deals with such a profound issue. It could have put more emphasis on the moral of the story with some implication on how our current civilization is destroying the planet right, now. You can't just take a story that is retelled by all major religions and make it into a superficial action movie.
Also, I wish there was a scene where we were given more detailed view abour the lifestyle of the city dwellers, why they are corrupt and how their cities die in the end. Noah could visit the king in his city perhaps to deliver him some message and tell him to join his cause, only to be rejected by the proud city people. That would make things much more interesting and give more legitimacy to Noah's abandoning of the city people.