'This isn't Doctor Who' ; 'Where is The Doctor?' 'This is Impostor Dr Who'. Everyone is asking similar things to this rhetorically. Perhaps we need to actually ask the right questions?
Perhaps we all feel it in our bones. Yes, this isn't Doctor Who. The Doctor has been replaced by the TARDIS energy matrix. His life-force is trapped inside the TARDIS.
When the regeneration took place the Doctor was suicidal. To prevent his death the TARDIS changed places with him. This is why the gender changed. This why she was completely blase at having new genitals, despite noticing last time that he had new kidneys. The otherwise crap second episode was called the 'Ghost Monument.' This was a clue that that was where he really was. Jodie is running around looking confused because she is the TARDIS, not the Doctor. In actual fact she is acting her socks off pretending to be a machine in a woman's body.
If this isn't true, the series is beyond awful and needs cancelling.
Review of Doctor Who
