Nikla Tesla's Night of Terror: aside from being better than last week's, I think there was a lot more going on too. It's a bit sad that this is noteworthy, but it's nice to see an ep with some conceptual cohesion. Mirroring the central theme, the argument between Tesla and Edison, in the showdown between the Doctor and the Skithra smacks nicely of competent storytelling. Felt a bit Davies era. (As did the Skithra, which were a pretty obvious reskinning of the Racnoss from The Runaway Bride. Right down to the Queen's particular brand of scenery-chewing.)
By my count, this is Chibnall's fifth historical, and fourth celebrity historical, in 1.4 seasons. That's quite a number. Not that I'm objecting, I think they're better than his average strike rate. More interesting to me is comparing the celebrity historical in Chibnall's era to those done by Steven Moffat and Russell T. Davies, because there are some sharp differences. Moffat's celebrity historicals are looong on celebrity, very short on historical (to their detriment, IMO). Churchill: cuddly curmudgeon with resolve and a cigar. Henry Avery: concerned pirate father, pretty much nothing of his actual depredations. Nixon gets the most superficial treatment he's ever been subjected to. We even get comedy Hitler, for goodness' sake. They're barely even theme park caricatures, they're so stripped down and sanitised.
(There is one important exception - written by someone else - namely Vincent and the Doctor. That one actually felt like it could be about a real person.)
Davies was more grounded in material conditions, so one might think he'd do better. But there's an odd quirk in his celebrity historicals - of his five such adventures, three of the names were: Shakespeare, Dickens and Agatha Christie. All writers. All mash-ups throwing Doctor Who into their own genre. It's a neat trick really, but it means that these aren't explorations of history, they're explorations of literature. If you take them out, the only other figures from the Davies era are Queen Victoria and Madame de Pompadour - not a lot for four seasons.
And then there's the Chibnall adventures. There's been a drop in the quality of the show, no doubt; but I'm going to say that this is one thing he does better. His celeb historicals feel like they care about the historical aspect. More than that, they strike me as being closer to the original intent of the show. I've mentioned before that at the outset, Doctor Who was supposed to be an educational show, alternating between imparting scientific and historical knowledge. In The Aztecs, the viewers were supposed to learn something about the Aztecs. The Reign of Terror was a French history lesson (more breadth than depth, but still). Viewers were intended to come away knowing more than they did before watching.
A single episode of the modern series, especially since it's now compulsory to make space for monsters, can't teach that much; but it can try to pique some interest. Moffat's historicals largely picked figures everyone knew and said "Here! You all know these two or three things about this guy!" (All guys, with one exception.) Chibnall, it's "Here's a figure you maybe don't know that well, but they're pretty interesting! Why don't you go google them?" I think that's a decently solid idea for the show in the modern era.