|Sad Llewyn and his cat du jour.|
This is surely a breakthrough film for Oscar Isaac, the star who I never saw before but will likely be seeing again. He's great as a singer and an actor, and makes you like Llewyn despite the fact that all the people in his life don't. A penniless couch-surfer, he sponges room and board from those few people who still tolerate him, and some of them can just barely. Even though he behaves badly, I found him to be the only decent one among the losers and weirdos he encounters in his hitchhiking, meandering travels. Maybe it's because he likes cats. Any man who likes cats has something extra going for him.
The true star is the script, which is quirky and odd like in all of the films by the writing-directing-producing brothers, Ethan and Joel Coen. It's also bleakly depressing, as Llewyn's life worsens with every passing minute, so stay away if you're unhappy, dying, broke or contemplating suicide; this film just might push you over the edge. Unlike some other Coen films, it's not a bit funny.