It wasn't bad, but the shocking twist of the last minute Master reveal was really weird. "Oh, I lied about my sprinting on my CV" could have covered everything up. And I cringe whenever I hear "Don't you think I would have made my bomb sonic-proof". They really need to find a script editor who can read this stuff out loud before it ends up on film. "Sonic-proof" and "deadlocked" are the two laziest ways of saying Doctor Who's magic wand won't work this time.
Right now I'm rating this one right down the middle. Without seeing part 2 I'm not sure if my complaints are minor or will be explained in part 2. It could be great, or "everything before is a lie" could be one of the greatest continuity blunders ever yet-to-come.
