I was a big fan of Smith and all his crazy antics and mannerisms... but I'm also very much looking forward to a calmer and more "mature" Doctor with Capaldi as well. I just don't see why a person can only like one kind of Doctor.
I'm a huge fan of both Tennant and Smith, but I'm surprised at how much I'm looking forward to a mature Doctor too. That's thanks in large part to John Hurt whose Doctor highlighted their crazy antics through his reaction to them.
I don't expect Capaldi's Doctor to be just like the War Doctor, but I liked that change to a more mature, no nonsense, less frilly Doctor. Hopefully this will be a nice change like that was.