I enjoyed that quite a lot, once the game began. Hopefully the setup next time will be more seamless. I don't know why I couldn't find the right server.
I had similar issues to you when I was trying to join the game. It kept saying that it couldn't be found, and was nowhere to be seen in he server. Perseverance seemed to be the motto, and once I'd gotten in the first time it let me join on subsequent attempts. Very strange. Using the steam server browser to join a game, rather than through the game, seemed to help.
As for the actual MP - It was great fun when it worked. I buttered up Lithuania enough to tempt them into a personal union, which offers a bit of protection and I was all for eyeing up the pesky Teutonic Knights, but they'd gone and allied themselves with Hungary which was giving me second thoughts.
Looking forward to Thursday!
Also, if whoever hosts realises they're not going to be there, then can they just email the save over to someone that will be there? If we're all on each other's Steam friends list, then that should be workable.