Rang De Basanti was the film in which Aamir eyes were speaking. He had to face 3 characters in this movie. One who don't believe in patriotism, one who was ready to sacrific himself on their country and one that was Chandra Sekhar Azad himself. And Aamir justified 100 % with all those characters. I can't even think about another person doing his role.
So, This is the best performance of Aamir..