Another good series, basically the same as the first one in style (80% jokes, 15% horror, 5% drama). I liked Tennant more as the Doctor than Eccleston, but they bring a similar attitude to the role. Evil aliens continue to be blown up at the end of each episode.
One thing that did bother me a little - so many of the plots are Frankenstein plots. I feel like the show's writers have an unhealthy attitude to progress. In the show, any attempt to improve things using science ends up (1) perverted by aliens so that it threatens to destroy the world, (2) gets out of control and threatens to destroy the world, (3) leads to the people trying it turning into inhuman monsters who threaten to destroy the world. I realise that it is not a deep show, but as a bit of a transhumanist, I do find this all rather distastefully Romantic. And I have heard far too many speeches from the Doctor about how wonderful humans are as they are now (i.e. pure noble nature) and how any attempt to change this (e.g. cure disease, extend lifespan, place the brain into a robot warrior body) will inevitably destroy everything good about us. Bah!