I must admit dont really know him, my initial though was oh he is really young but I trust the production team so sure he will be great. I bet he is really nervous following David. I would love it if the reeneration was earlier than everyone expects and then have a look back episode with both of them in the last special that would be awesome.
Tom Baker is my fav but David Tennant done a great job also like Sylvester McCoy-Jon Pertwee mind you they all have done a good job in 1 way or another
so what about Matt Smith? (must admit never heard of him)