Except the overnights increased by 0.2M. The consolidated rating isn't in yet but the increase isn't much to write home about.
And, yes, some good acting aside (never let the guest actor claiming to be a new incarnation of the Doctor be scripted and acted better (regardless of any ghost writing, and/or series 12 reducing the Tennantisms and Smithisms and trying to make a comparatively original incarnation), just like how you don't bring a guest comic into TNG and see how the regulars are mopping the floor with the guest comic), as par for his era it does feel like Chibnall trying to do "RTD Style Fanfic" - complete with "Nostalgia we you know you will loooove!" All while reusing sets to reduce cost in a new and brilliant way. The new incarnation is an interesting twist, though if they're going to play into continuity then Susan invented the acronym from the initials of the craft's description. And how the TARDIS will have remained there - Hartnell had only arrived there and was there for 5 months, maybe she is the final incarnation from a previous set of 13 lives/12 regenerations and becomes Hartnell and Susan is incarnation II as she's forced to regenerate, though there are more creative avenues one could take but this being the 21st century and all, nobody wants that... The chameleon arch thing is a bit Harry Potter but it works...
So was Missy/Rani/Adam/Davros. There's no better way to troll audiences than to leave it all so wide-open ended as it allows people to come up with their own creative thinking. Like Susan not being biological offspring but an adopted child from a ravaged planet the Doctor rescued before going all paranoid. But, naah, why be creative - everyone copulates and that helps increase ratings and appreciation indexes via the LCD, right? (Well, not always...)
The chameleon arch thing is actually rather clever, despite it being cheesy at the same time. It was no less cheesy a gimmicky plot device in 2007 to set up the finale, but woomp there it is. In order to re-open a continuity that never was but then was cobbled together* but was quick to fall apart again, Chibnall (or his ghost writer) did take a naff idea and used it to positive effect. Like when RTD took the melodramatic schlock in Dalek Invasion of Earth with puttering Earth across the galaxy via an electric motor into something big (a gravity based superweapon thing in the mixed-bag Journey's End escapade, which also took place yet again on modern day Earth...)
* But how many Doctors have said definitively that they were x regeneration? Brain of Morbius hints at previous incarnations but it's equally valid that the Doctor was tricking Morbius in the game by putting up bogus images to troll with. The fourth, fifth and seventh Doctors clearly state the number of times they've done it in the past. Can they all be subject to the chameleon brainadope all this time? In which case why not go all the way and say all WHO prior to 2017 was just one big arch-a-thon?
But people will bicker on everything; the show never has had continuity - right down to the number of hearts and the very reason the Doctor left Gallifrey to begin with. There are better things to nitpick.
Did you know all the aliens on Star Trek speak modern English? Stunning! 
