Rotten Tomatoes: 77%
The word I'd use to describe this movie: "goofy". XD
You'll certainly never see a Noah movie like this one again, that's for sure. And no, it's not true to The Book.
The goofy aspects include: Glowy rocks, healing snake-skin thingy, some interesting animations, and talking rocks (that's not even a joke).
So the aspects I liked about it: I kinda liked the goofy junk, but I wish that they'd gone full-on goofy. It felt to me like the director wanted to make a movie somewhat like the Harryhausen monster movies of old. A lot of the CG even looked like it was meant to mimic stop-motion. So if they'd made it even a little more in that direction and made it more kid-friendly with some cheesy dialogue, gaudy clothes, and some overacting I would've like it more. Just go "B movie" all the way. Make me smile, baby. Sometimes B movies can be truly magnificent. Just watch The Seventh Voyage of Sinbad. It's magical I tell you!
That being said, the stuff I didn't like so much: the grungy colors, the pants, the stone-jawed acting of Russel Crowe (the other actors did alright though), and the stuff that seemed more rated R than PG13. Sometimes I wonder how they get away with that rating.
Oh, and it was a little too long. I started to get a little antsy in my chair by the end.
So, would I recommend it? Oh... yes and no. I recommend it for the Harryhausen-esque parts which are hilariously entertaining, but not so much for the grungy "realistic" parts. Give it a shot if you're bored.