Like many of the New Series cliffhangers, I'll reserve judgment until next week. So often a great 1st episode has been let down by the resolution in part 2.
I did enjoy a bit of Nardole and the Doctor on the alien world flashback and learning their history, but then the BBC spoiled us about Missy so instead of watching I ended up trying to figure out how they're going to get to the conclusion that's already been announced. Bad BBC.
Bill still hasn't done anything too annoying so I'm fine with her sticking around.