Capaldi was a better Doctor than his writers allowed. Man was just dripping with cool, but we only really saw it a couple times (like when he picked up a guitar). My initial sense was that he was too old for the role, but that thought was banished after a couple episodes with him. I liked Capaldi as a Doctor, but he was held back. I feel like while Whittaker was channeling Tennant, Capaldi was like an older Smith.