So beautifully shot. A non anthropocentric story, with echoes of ethology and ecology. The only truly good movie with animals I can think of that does not exploit them and makes them silly, by anthropomorphic comedy or unrealistic plot situations. The cub, though, at times seems to have some excessive vocalizations, but it's a detail that does not hurt the enjoyment of the story.
Purely from a technical POV, it's an amazing accomplishment. This grizzly bear on screen is far more believable than anything a digital coven can produce, yes, even in 3-D. Of course, I'm not sure a purely technical POV isn't just an apologist's strategy to champion a so-so film.