@TheGodling is pretty spot on about the movie. There's some 30 minutes in the middle that dragged the movie down for me, it's a fine line between trying to show us what Leo was going through and just show us a bunch of nothing that doesn't really connect with the viewer, I fall on the latter.
Still, damn good movie with just amazing cinematography. Just way too slow in the middle, it's on that portion were you'll realize if you are really compelled about the story, can't say I totally was
Regarding Leo...he did everything to get that Oscar (again). It's very different from other roles, way more physical and non verbal, but he pulled it off.
The bear scene