It wasn’t a terrible episode but it was partly reminiscent of The Pit and the real problem was once again in the script. Having made a song and dance about the fixed points in time and created some really drama and tragedy having the Doctor go back in and save the day was actually just lame.
You go from feeling for this character who can achieve so much and yet cannot intervene here to feeling like the rulebook gets torn up whenever it’s inconvenient. Even the hubris argument isn’t really convincing because for Classic Who the Doctor was a renegade for changing time anyway and in the new version there was a strong incentive not to mess around with time to avoid unravelling the Time War.
Almost as disappointing as the big Master reset button but I’m still looking forward to the Christmas Special.