Well, IMO, that was a solid opener.
I guess it's indicative of a pro and con of Doctor Who, in that the content is great, provided you suspend your disbelief enough to appreciate it, e.g.
-Con: The Master is still alive, is now a woman, is a murdering psychopath that gets off scott free.
-Pro: Missy is awesome.
-Con: Davros is still alive after the events of the Medusa Cascade with no explanation.
-Pro: Davros is still awesome.
-Con: Daleks, the Doctor, "exterminate," Skaro, we've seen a lot of this before.
-Pro: That stuff is still awesome.
So, yeah. Enjoyable, but I do admit it has a lot of "just because" in there as well.