Matt Smith as the new Doctor?

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So I watched "Doctor Who Confidential" last night, and they announced that a guy called Matt Smith would be taking over from David Tennant in Doctor Who. My first reaction was "Matt Who?" as I'm not familiar with this actor - I've not seen anything he's been in. This isn't necessarily a bad thing, as casting an unknown means that people aren't going to associate him with other roles he's done in the past. But he also seems really young to play the part - he's only 26, even younger than Peter Davidson was when he played the role on TV. Obviously I'll have to give him a chance to show what he can do, but it seems to me that it's about time the role was played by an older man again, someone with natural authority. Personally, I would have brought Colin Baker back. I've already started thinking of Matt Smith as "The Medical Student"! What does anyone else think, is he a good choice for the part or not?