S1 seemed so perfect and contained that news of an S2 routinely perplexed people. I think people were right; there was nowhere really to go. Lots of back story filled out here - with the primary magic now being time travel, it's basically all about back story - but, somehow, it feels like we didn't need it terribly much. There are, I guess, good and dutiful points being made about understanding what previous generations went through and how that shaped us, especially our spiky bits, but in practice I just don't feel it all with the intensity and enjoyment that I did S1.