So I should probably hate this episode for what it represents and for what it does to the Doctor as a hero of the working class... But I'm just not going to beat myself for actually liking about 3/4 of the episode. It is fun, and the mystery is actually engaging. It just sucks that the resolution is so bad and out of sync with everything that came before (e.g. The Sunmakers, Oxygen...) I just know that if this were under Moffat the Doctor would have fudged that company up so bad. The Doctor is pretty badass as she confronts management for 40 minutes, and then at the end she does nothing to subvert the status quo (although you could argue that she knows that capitalism will end after the events in Oxygen, so she can't really alter the course of history, I don't believe they thought about that, it's my head cannon so I can sleep at night)

PS: I agree with everything quantumshade wrote, great review.