@Sylvhem Maybe this episode could have stood well on its own, but it just seemed like an inferior version of things Moffat had done before.

The two Masters together should have been great, but I didn't think it was as good as Ten and Eleven being together in "The Day of the Doctor".

One showing up at the end wasn't as good as the introduction of the War Doctor at the end of "The Name of the Doctor" (which is one of my favourite scenes).

Bill's ending was very similar to Clara's ending (which I didn't like very much anyway). (Although I am glad Bill and Heather got a somewhat happy ending).