I was really looking forward to the payoff and figured it would make or break the story, and I found it satisfying. They may be going to the "monster that isn't really a monster" well a bit often lately, but it worked ok. I kind of figured the Doctor was the the Architect.
I just love Capaldi's Doctor. Every time he is on screen I just find myself mesmerized him. The Doctor hasn't been this enigmatic in a long time, but it's done so well that it doesn't alienate the audience - or at least not this member of the audience. Looking forward to Gareth Roberts' story next week.
Sorry for the slowness of reviews lately. Been out of town some two of the past three weeks, so I haven't been listening as diligently as normal. Hopefully I can listen to and get a review up for "Davros" before or on this weekend.