I could have lived without the Amy/Rory divorce plot bump as well, especially this close to their exit, but I rather liked the rest of the episode, especially Jenna Louise-Coleman's appearance. I very much hope she's playing the same character here that we meet again in the Christmas special, as it's the first time I've felt that any of the modern companions stood a chance of keeping up with the Doctor, and on his own turf no less (my favorite of the other modern companions is still Martha, as at least she was willful without being mostly intolerable, like Donna).
I think the theory that Oswin is a descendant of Clara is likely, though that would be disappointing. For a while I've been hoping that one of the new companions would originate away from modern day Earth - from the future, say, or perhaps from another world. All signs appear to point to Clara being just another 21st century human, however, so I'll keep it simple and hope she shares Oswin's spunk, and perhaps a little of her intellect.