It's ok I guess. It's pretty straightforward in all aspects, and on higher difficulties it gets bonuses to gold and resources.
I haven't played a lot of multiplayer, but I can tell you it feels very different from single-player, if only for the fact that you're encouraged to be as Machiavellian as possible, whereas in single-player it's a linear game of conquest. In MP, non-aggression pacts are meant to be broken, and alliances are a race to see who can overrun the common enemy first >:)
Hmm I thought I was the fastest since I kept churning out researchers for Blood Magic. Ah well, I should have waited a few more turns D: