I did like it, but I also believe Twelve got the wrong message. It wasn't save everyone at all costs, it was "save someone, work within the laws of Time to find a way." That's how I saw it. Then again, if he did get the right message, then perhaps we will be exploring what happened with Frobisher (if he was a descendant of Caecelius, and should never have lived). The consequences of ignoring the timelines... That's a way of bringing both into it, when he sees the consequences of what he did this time.

Clara does need to get a new hobby, though... it seems she will, one way or another. An overarching theme this season seems to be hybrids (even the throwback to Donna... DoctorDonna), I wonder if that will be the culmination of Clara's experiences. The Doctor most certainly is leaving behind a trail of hybrids, isn't he? (Dalek/Time Lord, Human/Mire... what next?)

And seeing Donna again... indescribable!

I hope your new prescription works out for you; having the wrong one just makes everything totally awful!