Could have been great with a slightly different ending.
I am not saying Liam Neeson should have killed the wolf and walked back to civilization and gotten rescued, with a happy ending for all.
I just think they should have showed some of the fight before cutting to black. It would have fit the man-against-nature / will-to-survive theme of the rest of the movie. They could have cut it off mid-fight, both the man and wolf wounded, staring each other down, duel to the death, and then cut to credits just as they resume combat.
Instead we're left to wonder if Liam Neeson even put up much of a fight at all. Was this his way of trying to commit suicide again? Was he fighting because he was tired of running, win or lose? Too many questions.
I don't think the over-ambiguous ending was deserved or fit the overall tone of the film, which was mostly an action-adventure-thriller film with some interesting existentialism thrown in. That's the kind of ending I expect from and Ingmar Bergman drama film, not a movie that has mostly been a Liam Neeson man-against-nature action flick until the last 5 minutes.