Using a machine to solve everything was annoying to me. It would have been better if they used paint - and would have served as a much much better metaphor for van goghs state of mind.
New episode was really good. It wasn't very doctor who-ish (a lot more drama in it than sci-fi) and it was definately the best out of the 'let's go visit a famous artist from history' episodes. It is on my top five for the best episodes I've seen ever.
PS: The actor for Van Gogh was absolutely great.