I'm not sure how I feel about the movie.
The wolves were indeed very dangerous competitors for men, and can be dangerous till today in certain circumstances. But for me they did not feel realistic in their behaviour. Partially because they were CGI animations. Still.
Rough ride. Everyone dies. Except that one guy who builds that raft and floats down the river.
Abrupt ending. Those who left did not see the post credits scene. Short scene, but still.