Excellent example. Redmayne is a very talented actor, but that role was awarded for for its acting stunts rather than his understanding of who Hawking really was.
Birdman was very much an actor's movie. I went to see it with my actor friends, and had a wonderful time. Even setting aside the wonderfully long (and tricky) takes, it was an incredible exercise in performing the same scene several times in different ways. It was full of great performances, and Keaton surprised the heck out of everyone.
I notice that Iñárritu has a new film coming out on Netflix soon, Bardo, and I'm really looking forward to it.