It worked but it worked very much from a modern omniscient point of view.

Ah, thank you, I knew something was off in that way but I couldn't put my finger on it - I just knew I wasn't as deeply involved in the story in the second half but I couldn't see why.

I felt it was a great shame, Human Nature was damn near perfect, just about the best episode there has been, and Family of Blood was a very imperfect ending to it for so many reasons.