So... Kill the Moon and Mummy on the Orient Express. One good episode, one pretty much awful one.
Let's start with Kill the Moon, because that was the worse episode. No wait, probably the worst one in the entire season.
Because damn, the way the plot was written was just... so, so badly thought out. First off, you've apparently got the moon itself being an egg for some space dragon creature, despite being there for millions of years and being analysed by who knows how many scientific expeditions and robots. You've then got the choice about whether to kill this creature, which is treated like a really badly thought out abortion metaphor. Yeah okay, apparently it would be fair to complain than people might value their own civilisation/lives over that of a creature that's both half as big as the planet and has completely unknown motives.
And then, the ending. Where the moon not only breaks harmlessly (like an egg, despite being made of rock), but then gets replaced by another egg of the exact same as the previous moon. How the heck does that work? Conservation of mass? The fact a creature that was born five minutes ago can apparently lay an egg about as big as the one it hatched from? And Clara complains about the Doctor abandoning her to make the decision, despite the fact that for years, he's made almost every major decision in regards to the future of the planet and just wanted humanity to make one of their own choices for once.
Fortunately though, Mummy on the Orient Express (which miraculously, is by the exact same writer as the above episode) is brilliant. You had a brilliant, interesting setting (the Orient Express IN SPACE!), a creepy and well designed monster (the Foretold, a mummy which kills anyone who sees it in exactly 66 seconds and can only be seen by its current victim in the time prior to their death) and a supporting cast list you actually like. Such as the professor, who has such a... well, darkly hilarious line before he dies:
The next one? You mean, you can't save me!?
Or the Captain (Quell), who fears the Doctor is a mystery shopper. Or Perkins the train engineer, who is both potential companion material (despite turning the role down at the end of episode) and had the amusing job of starting the count down every time the Foretold attacked (for everyone else's convenience).
Other strengths of the episode were the humour (like the Doctor threatening to 'give the service a bad rating for this!' when he outed as not a mystery shopper, or talking to himself in Tom Baker's voice and mentioning jellybabies again), the logically done, well thought out mystery (everything from the suspiciously high amount of experts on the train to the Foretold itself was explained perfectly) and most importantly, the pacing.
Yes really. It's yet another Doctor Who episode (after pretty much a whole season of them) where they didn't rush the story! This is a great relief considering how many stories in seasons 6 and 7 were completely ruined by a rushed ending and a pacing best described as 'completely random'. Instead, the formula harkens back to the first five series of the revival, where things felt like they progressed in good time and got wrapped up in an interesting, entertaining way.
So all in all? Kill the Moon was terrible, Mummy on the Orient Express was amazing. Those are my thoughts on the last two Doctor Who episodes!