I think it was a great movie.
The questions it asks or shows are thrilling (post of sir82).
The only thing I didn't like was how the "watchers" (fallen angels decribed in details in the book of enoch) are pictured helping Noah. That was pure fantasy and not even very good as they look like the "ents" from Lord of the Rings.
Aronofsky would have had enough spectacular elements if he shows the fallen angels and the nephilim like described in the bible and book of enoch.
I really loved how creation was shown, as I tend to believe in "theistic evolution.