The meanest game in existence that is not unfair or "take that" - the game of constant losing and frustration. The only game around which I had serious argues with my girlfriend. It is mechanically not made for me because I simply cannot, even after more than 70 plays, remember to prepare for some nasty cards that are coming...
Yet, it transfers Cold War events into its abstract numbers with such an elegance, it is thematically so correct and so full (despite necessary reduction to domino theory), and it is, after all - my first game, my first (kinda) wargame... I hate it, and I love it. There is no greater stress than rolling for coup, no greater proud than spreading communism through Africa or South America even though I know I will ultimately loose.
Yes it can be random, or at least dice can ruin one whole game. But more often than not it balances itself throughout the session. Otherwise - it deserves a perfect grade.
It is in the end, no more no less, the greatest board game ever designed.