Absolutely unmitigated crap. I hated it. Rosa was a highlight, but just showed me why I never wanted Chibnall in the first place - he's the kind of writer who can produce a Dinosaurs on a Spaceship once in a blue moon, and it's very worthwhile, but he's not got anything beyond that.
The scripts were dull and plodding, the preachiness was off the scale. I mean Who has always been able to bring certain messages through, but in an episode like The Doctor's Daughter, for example, the anti-gun, anti war message is actually part of a decent story, and 'make the basis of your society a man who never would' is an emotional high point, rather than a shoe horned in sermon.
As for Whittaker, I'm hugely disappointed. She's incredibly bland. It's like the person we've all known in our lives at some point who is all "I'm mad, me!" because they wear odd socks and occasionally pull gurning faces.
She's only ever got authority if the other characters in the story say so. It doesn't come through from her directly at all. Which might convince as a deliberate choice like Troughton's clowning but for the fact that she just doesn't have a steel beneath the forced whimsy.
And her delivery of technobabble is bloody awful. She still sounds like she's saying memorized lines rather than speaking knowledge from ginormous brain.
So yeah. I know, because certain websites keep pumping out articles about how it's the best Who evar, that some people love it to pieces and all, but I haven't disliked Who as much since Colin Baker.