This was a fun and standard episode. After last week's incredible outing, there was no way that any followup could maintain that level of quality. This episode didn't, but it was still pretty fun.
Cons:
This would have been a great opportunity to get to know Yaz a little better, and while it was nice to meet her family, I still feel like she's underdeveloped compared to Ryan and Graham. The emotional beats of this episode were still focused on Ryan and Graham, even though it was Yaz's family that was getting pulled in to the adventure. I hope we get a chance to dig in deeper with her and her family.
The villain, Robertson, is a little too on-the-nose for me. Sure, the environmental message of the episode is all well and good, but when the villain is cartoonish, and they even go so far as to have him running for president against Trump, the whole thing gets a little bit too sledge-hammer-y for my taste. Doctor Who has never been known for being subtle, but even so... come on. The part where he talked about how normal humans pick up guns and shoot things? Yeah, we get it. America is the worst.