alm4rr--Glad you like it. I still haven't tried either the demo or full version. My gf will be here for a week. We usually try playing something on my network.....but, don't know if she's up to Medieval or not.
There is MP, BUT, but for battles only. No full strategy MP. You know...the Risk-like map where you take over territories. Lotsa people like to play the battles online, MP, but, I never have tried it.
IMO....without having played Medieval, but having followed the pre-release discussions on the forum, I'd say you'll love even single player. For me, even with Shogun, I got way more than my $$$'s worth, playing only single player. And, AI is supposed to be improved in Medieval (I didn't think it was all that bad in Shogun). And, lots more variety on the battle maps and larger battle maps. And, consider how many different factions you have that you can play.
You might want to check out the forum, but it is hard for me to imagine any gamer not liking this game. It is so diverse, with the strat map, and the realtime battles.
--Randy