i have not liked matt smith since he started and in fact didnt really like him in this one either but thought despite some rather crummy cgi and a ridiculous first 30 seconds which was silly and pointless the episode was fantastic. loved the new creatures, the way people forget them - fantatic episode
I really enjoyed the first two part story concisting of The Impossible Astronaut and Day Of The Moon. The Silence were an excellent monster and I hope they return. The story was well written and nice and scary in parts. I must admit I do prefer David Tennant as the Doctor and wish he had stayed on, still Matt Smith has a charm of his own. As for the unanswered questions I'm sure they will be answered when the last 6 episodes of series 6 are shown later this year. Can't wait.