I liked it. I went in thinking it would be a land-mark episode, but afterwards it occurred that it had to stand alone rather than impact any story-line.
The only bits I didn't like were the shoe-Horning in of the new doctor. It was both contrived and half-assed which I didn't like. There were also nerd-level details that annoyed me (the first TARDIS being a police box, even though it took that shape when Doctor1 first got to earth, and Jack Harkness' "death")