I finished this earlier and it started off okay, I mean, slightly better than most Russel T. Davis stuff but nothing brilliant, because he ain't brilliant - it felt very Doctor Who. There's an marked improvement around episode three and during episode four I thought some of the discussion mirrored Battlestar Galactica's level of writing. I was actually impressed for once my in my life that real tension had cropped up (in Torchwood, nonetheless).
This is my first viewing of anything Torchwood, and I'm not going to go back on watching the first two seasons due to everyone calling it crap but, I agree with the majority of viewers that this was actually quite good. It had less worm holes than The End of Time and carried more genuine emotion, and not emotion for emotions sake.
So, I liked it.
Worst part was easily Jack saying "I'm back" in Arnie fashion. Whoever came up with that idea is a moron.