1)Now we get a "vampire" story, used essentially as a background for developing Rory as a character, and for developing the relationship between Rory and the Doctor, as well as that between Rory and Amy. I liked the way they had Rory criticize the Doctor a bit, but that in the end, itlooked as though there was potential for them to become friends. I thought the Doctor's idea of relationship counselling was pretty amusing, too.
2)The Saturnynians we acceptable baddies - nothing too amazing, but credible creatures. Francesco was extremely oedipal, but maybe fish look at these things differently. And of course, "fish" would be running a "school".
3)The stag party scene was kind of lame, I thought. Apparently, the Eleventh Doctor doesn't do subtle. Also, he hasn't updated his library card in ten lifetimes.
4)Some fun quotes:
An entertaining enough episode. More noise about the "silence". I can't help thinking that the "silence" mentioned here represents something above and beyond the "Silence" we encounter later on - like there's still some element that we haven't seen yet.
[Part of list of Doctor Who episodes here.]