I actually liked this episode very much, not necessarily for the subject matter but for the writing and acting.  It kept me "riveted" as very few episodes do.  I did not get any vibes that the father was anything more than just physically abusive toward his daughters.  Another favorite is "The Black Room" which kept me wondering the whole time what was going on and a difficult episode for the actor since it was basically a monologue.  It's these occasional gems that keep me listening.