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I wouldn't go as far as to say DiCaprio was underrated for his performance in Shutter Island. He gotten a lot of praise for it. His performance was the talk of the film, if anything. He might not have been nominated for an oscar or anything, but given the date that the film was released, I am not too surprised.
I would say that Casey Affleck's performance in The Killer In Me was a little underrated. The (extremely uncomfortable) violence against women grabbed the headlines for the reviews, but only a few really went on to give his performance the attention it deserves. It was definitely brave.
A shout out goes to my girl Gemma Arterton in The Disappearance Of Alice Creed she's actually really good in it and I never not believe her. Of course, i am a little bit biased since I would do anything for a date with her, but she is actually very effective as the victim caught between two dodgy geezers.