I think these specials are excellent. I actually like this one the best of the three.
I like that they can bring back old villains like the Toy Master and old companions like Mel. I didn't much like the idea of Q in Star Trek, so I wasn't that keen on the exploits of the Toy Master turning guns to shoot rose petals, nor did I really understand what was going on. There was a lot less "science fiction" and more "fantasy" elements in some earlier WHO so it isn't that strange to bring that kind of thing back, but the idea that the Toy Master could do weird things in his own Universe is quite different to doing it in ours. "He found a way in," is the only explanation we got given.
Then there was capturing the Time Lord Master inside a gold tooth, then losing the tooth, and a nail varnished hand picking it up - quite sure that will be revisited, whatever that meant.
This was a rather adult story, and I'm sure that the animated dolls climbing up Donna will give sleepless nights to some children, but that is what Doctor Who used to be - the Autons inside of dolls was no different really.
The new Doctor is going to be quite a change, I'll have to see if I like him, he seems quite extroverted and a little too camp. I hadn't noticed the lack of trousers, but the undone tie around his neck makes him appear to have just got home from a really good late night party.
I'm quite sure many fans will be annoyed by the Bi-Regeneration. I liked it, but only because I thought everything that was possible with Regenerations had been tried already. I was pleased to have been found wrong. Again, I'm not quite sure how that works either. Of course the TARDIS split in two as well. It is tied to the Doctor so inextricably that you couldn't have two Doctors and only one TARDIS. But is David Tennant going to have parallel adventures now?
When you have any answers, please let me know.