Negatives:
Inauthentic representation of the pre-2023 eras - the producers probably should've taken the time to research how people spoke and behaved during specific time periods; the fact that they didn't is glaringly obvious and distracting! (Watch another period drama if you can't be bothered)
Poor casting - from all the thousands of actors out there, you couldn't find a more charismatic/memorable/impactful Julian Harker?! Or Danny Barber? Or Defoe? Gosh, terrible choices. (Dis)honourable mention to Iris Maplewood as well, though she's a good actress, at least.
Tepid chemistry - you just couldn't get invested in the Polly/Sir Julian or Maplewood/Defoe relationships because there was zero on-screen chemistry there. Polly and Sir Julian together was just strange.
Positives:
Engaging story
Nicely tied-up ending
Give it a watch, sure!