After watching the season premier...first impressions: he's decent, but he's no David Tennant. I suspect his current costar will be making up for his shortcomings in episodes to come, though. I also strongly dislike any hint of a direction towards a more mature audience (not in general, but specifically for the Doctor Who TV show), but I guess it makes sense since (if I recall correctly) the writer for Torchwood is now authoring Doctor Who. Could be wrong, but I think I remember reading that somewhere.