OK, not especially sfnal, more kind of magical, but I thought it dealt with the dysfunctional family setting much more realistically and compassionately than "The Idiot Box"; it was well written, grippingly filmed, brilliantly acted.
And, of course, we have the foreshadowing of Rose's imminent departure - the Doctor unable to give her straight answer (if indeed he is even listening) as to how long they will be together, and his casual remark that he was a dad once, to which she can't think of anything to say.
(I know this is a bit heretical, but I am not overwhelmed by David Tennant's Doctor. He's good, but sometimes he's over the top in mid-to-late Tom Baker mode, and I'm afraid the scene with the Olympic Torch at the end was the one bit I didn't like about this week's episode.)
Edited to add: first two comments on my f-list: ang_grrr hated it, blue_condition liked it but not as much as I did.