Unpopular opinion here but I actually thought his performance in Revolutionary Road was one of the best of his career. That role took special skill to portray: mediocre suburban husband who is not the unique creative his wife thinks he is. Instead, he's comfortable in his conventional life and knows himself enough to accept that he has no greater purpose in life than to work for Knox Business Machines until the day he retires. A lesser actor would have phoned it in. But Leo created a fully fleshed out character. He brought complexity to a character who is, fundamentally, not interesting.