I've been really impressed so far with the Cities in Ruin expansion. I think the Disaster deck has really added a nice fresh dynamic to the game. I've lost a fair few solo playthroughs vs Shudde M'ell due to chaining disasters in the late game, but its a ton of fun watching the world turn to ruin! This is my favourite small box expansion so far and a welcome addition to the game.
If anyone wants to see how I got on vs Shudde M'ell you can check out my youtube channel below where I've done a time lapse of a Shudde session and I talk a bit more about gameplay.