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I thought it an 'uncomfortable' episode. There was the plus of no Clara, the minus of Rufus and the big minus of poor writing. The concept was great and I loved some of the backgrounds in terms of immortality and a human sized memory, and it shed an explanatory light for those who hadn't already worked out those issues for the Doctor out, but the sudden about turn at the end for Ashildr was jarring and wrong, unless it is the opener for a future plot twist? No. Not a good episode, few of 12's episodes have been as good as his predecessors, but often that is down to the writing team as much as the actor.