I can't say I liked it much. First of all, the CG was just awful; it took me right out of it every time we saw an animal as they were so fake looking. Everyone was uniformly dirty, so combined with the overuse of shaky cam you couldn't tell who was who in many fight scenes.
You might think this is a pretty stupid complaint, but I also found the casting rather, concerning for lack of a better word. It seems like Noah and co were all WASPy, while the bad guys weren't. Looking at the cast page, they're all English, so it could have been my imagination, but the whiteness of the cast certainly stood out.