I quite enjoyed this episode. I hadn't read any spoilers, so I was really wondering what was going on at the beginning - very creepy.
It was also great to see Connor Trinneer back in action.I enjoyed Enterprise, and it was great to see "Tripp" back on the screen, even if he was playing a wraith.
I'm a little disturbed at how easily he got away though - why didn't they have more security in place?
Very creepy that the wraith probably know all about Atlantis now, though.