I personally find the game to be fairly enjoyable, I just want it to be playable past a certain point. A strategy game that starts running like crap when you finally get things going is a very flawed strategy game.
The only crisis I got to experience was the AI Revolution, and that was so underwhelming it ended up having very little impact anyways. I'll just come back to it after a year or two, hoping they fixed my complaints with it.
Dear god the slideshow. I have 5 save-games stuck around 2300-2400 because I just couldn't put up with the sub 20 FPS I was getting; It got to the point where if it starts lagging hard, I just start up another save.