As the season is moving in for the finale, I guess this is a good moment to evaluate.
I liked but didn't love S8 so far. That fast-paced, wtf-heavy pacing they started in S7? I like when a show keeps you on your toes. And I've long accepted Doctor Who as a guilty pleasure rather than a good show, so I can't get as angry as some of the people in this thread when they do their more pretentious bits.
What puts me off, though is that the season pilot made two ... I wouldn't call them promises, more like mission statements that the show hasn't managed to deliver on since.
One: The question of why the long face? I mean, what was he trying to tell himself by being reborn with the face of a guy he saved despite himself back when he was half his current age? (Or maybe it was about something else altogether?)
Two: At the end of the pilot he says something like 'it's time to do something about all the damage he's done'. Or maybe not about the damage itself but about his damage-doing in general. But apart from him being somewhat confused about the best course of action in some of the following episodes, I haven't seen him do much in that department either.
There's a possibility that Two is already the result of One - something like, "I used to be a reckless adventurer type, but that one time I saved some folks and now I get reminded of that every time I shave (assuming I shave), so maybe I should be more concerned with saving people and being less reckless", but that would be a little anticlimactic in my book, and anyway, he didn't become less reckless, just less decisive. Not really seeing it yet.
If anybody thought one of the promises I was referring to had anything to do with Missy - Nope. Those scenes are just annoying because they don't build up toward anything as long as the character isn't grounded in anything that the protagonists are involved in. It's Storytelling 101 - acting like a big bad nemesis doesn't make you one, especially when the guy you're pretending to be a nemesis of doesn't even know you're there.