The microtransactions is the least important reason to wait for a sale - they have no impact on the game what-so-ever, you should ignore them and that will actually only improve your experience.

Well I got MD from the Humble Monthly and... ehm... I don't really like this game. I really have to push myself to even start it up and playing it I decisively want to play something else instead, I'm just not having any fun playing what-so-ever.
I'll probably just drop playing it entirely even though I've only seen half of Prague... Going through the metro and now having to do another even LARGER section does not entice me in the slightest