He's been nominated for What's Eating Gilbert Grape, The Aviator, Blood Diamond, and The Wolf of Wall Street. He went through that hearth throb time in the late 90s, nothing of which I considered roles deserving of an Oscar. I was never too impressed with his role in The Aviator, it was on par with the other nominees of that year. The role I believe he should have won for was his role in The Departed, i loved his performance. I wouldn't have mind seeing him win for The Wolf of Wall Street, but my goodness, that was a great year for nominees. It was so good that Tom Hanks' Captain Phillips and Joaquin Phoenix's character in Her was snubbed.
From the predictions, it will be DiCaprio, Redmayne, Fassbender, and most likely Smith being nominated for best actor. Personally, from the roles I've seen, DiCaprio deserves his first Oscar win. But I think we all know Redmayne will be taking home the Oscar due to politics and media drive. The fact Redmayne won last year over Keaton should be labeled a crime.