* The main (titular) twist was perhaps telegraphed a bit too easily.
* The end-of-episode "whoops!" was explicitly telegraphed
uncomfortably close for my liking.
* Though capable, Tate (not-a-spoiler, the trailers are explicit on her character being there) is unfortunately not in my "most favourite companions" list, though I did warm to Donna significantly more post-Runaway Bride. Gonna have to consider what I think about her being the one seen again. (I'd have prefered Martha, but then it'd be a significantly set of different plot devices.)
* Call-backs were plentiful (references to Wilf seemed the most awkward, but I know why they did so), but I
think those were demanded by the 'relaunch'.
* The "Marvel-like start ident', and possibly the cursory "as you know" exposition/lukewarm-opening was probably pushed for by the new Disney input (...oh dear... I fear what the Disneyfication will do to this series).
*You can see the Russell T. Davies hand behind it, inclusivity-wise. For those upset with Whittaker's season of 'wokeness', who I have absolutely no sympathy for[3], they'll be squirming even more. Let them. The UNIT scientific advisor (I think last seen by my in The Watch, the 'this is Discworld, honestly' miniseries) does quite well to be (badass-)normal, in that manner. The biggest casting/plotwise surprise
had to be telegraphed[4] and even a bit lampshaded, but I suppose not too shabbily given everything.
* Effects-wise, I was... Underwhelmed. Plenty of them, CGI and practical. Notwithstanding 'bulletproof cars' that weren't (I thought that was an error... but soon proven wrong!) there was a rather huge battle set-scene with probably actual physical effects, and doubtless augmented by CGI. But the CGI in the 'main peril to the area' scene was... shoddy? Reminds me of a mix of Ninth Doctor-era, Eight's 'TV Movie' escapade and the notorious 'filler' (low-budget) episode
from Ten's time. HD effects, certainly, but very much in the form of CGI compositing from
as far back as the eighties. Actually, there were probably many matte-renderings that weren't so bad (I doubt that they had a handy skylight like that, let alone two of them), but the
piece d'resistance may have simultaneously sucked up far too much of the FX budget
and not enough... IMO. Maybe a future rewatch will change my mind on this. (More generously or less so..?)
* The peril of the rather impractical-sounding technology was, anyway, far more ridiculous to me (submerged to some extent in the whole Whoniverse... Good, bad and 'giant green maggots') than even the basic threat(s) that arrived with it. I can think of about five different methods to set up an area-wide threat that would easily slot into the rest of the conceit (assuming the rest was irrevocable as a script point), and could have been done with... 'middle of the road' effects, shall I say??? (Reversible ones!)