I really enjoyed this film, I thought it was a nice balance of horror and just good story telling. There was nothing gross, no gore, just suspense and paranoia- and quite a bit of unsettling comedy actually. There was a moment towards the end- probably when Charles Grodin turned up- when I thought "Jeez, maybe it is all in Rosemary's mind, maybe she's just mental!"
But it turned out everything was fine!
Oh wait, no it wasn't! She gave birth to the son of Satan!