It was okay. But it continues to display the things I like less about Jodie's doctor. Everything that happens to her still seems like it's "wow" all new -- what happened to the universe-weary Doctor that's been around for 2000 years and wears it on his/her sleeve? Jodie's doctor is more like a perky Disney scrubwoman, except one who relies way too much on technobabble to get things done. It's like the Voyager era of DW.
I agree with Wacky that the ending was lame -- Aaron became a contributing Scooby gang member with ideas way too quickly, and the Great Plan & its execution was a sloppy mess. Maybe that's how they want to portray this Doctor's personality in general, but again, what happened to all the Doctor's wisdom and experience? Even goofy Matt Smith pulled off the tragic, beleaguered side of the Doctor once in a while. I know there have been previous Doctors like Jodie's (Cheerleader Doctor & the Gang) but I'm just not enjoying it as much. And again, too much technobabble, or more specifically, too much REAL-WORLD technobabble as opposed to mind-blowing quantum technobabble. Jodie's Doctor spends as much time explaining wi-fi and satellites to her gang as she does the mysteries of the universe. And is it me, or is this gang harder to impress than other companions? It felt like she was trying too hard with the trips to various New Years, and the gang were obliging in their awe, like kids in the back seat of the car. One of these days, Jodie is going to have to take command and scare the shit out of these mortals. Less mothering, more tough love. The one Scooby member whose losses I really feel more than the others is Yas, but they spend more time on the father/son deal of Graham and Ryan, which is okay but feels more manufactured to me.
I know all this is more the fault/choice of Chibnall than any of the actors (also that it's only my opinion). I know the roots of this show are more of a kiddie sci-fi, but if they are going to aspire to have it be more than that, they have to be careful about how they produce it. It feels more like a kiddie show to me now, but at the same time they are trying to root it in the real world and play it like a procedural. It's not a comfy fit for me.