I hosted a Mega-Carcassonne game this past weekend at Wintercon in Detroit using the following expansions: Base Game, River 1&2, Inns&Cathedrals, Traders&Builders, Princess&Dragon, Abbey&Mayor, King&Scout, Cult,Siege&Creativity, Wheel of Fortune, and the Count. Everyone agreed not to play the Catapult because of how hard it is to fire it anywhere but straight up. There was around 300 tiles. The game lasted about 4.5 hours and we were the last game to finish at the convention. The highest scoring player got 350 points, 95 of those points were for black's barn which is in the back left corner and the farm expanded to the City of Carcasssonne, and even to the back right of the Wheel.
All the players had fun. General consensus was that they didn't like the Count, but everything else seemed cool. I tried to take advantage of the Count as much as I could, but still didn't get enough points to win the game, or even get 2nd place. One guy was an older guy and he said that he was happy enough just playing the base game with the river. There was a couple that played with us that had some interesting names for the figures. They called the builder Satan, and the Mayor was Mr. Happy Pants. I don't think I should repeat what they called the Fairy, and they had another name for the Princess that was so bad that they wouldn't even mention what it was.
Another thing that I found interesting was that the biggest city (33pts) scored less than the biggest road completed (36pts). The longest road also had both tunnel pieces(from P&D and A&M) right in a row, so it escaped and continued to grow after I thought it was trapped.
The cheat sheets I made were helpful, although there are a couple errors on it, and it doesn't mention scoring of the farmers. I'll get it updated here at some point and upload it to BGG and here, if you'd like.
