I enjoyed the episode overall but like others I did feel like it was rushed. I don't know why this couldn't have been a two parter! I'm glad they tied up most of Matt Smith's run, hopefully Steven Moffat will go for simpler story arcs with the new doctor. Not that I don't like complicated but his stories have always seemed complicated for the sake of being complicated.
As some people keep bringing up RTD I think his version of sending the companion home was much better.