Been playing MP for about a week and a half, it's been fantastic! Have not completed a match yet, been losing most, but you (I) learn aspects of MP continuosly, mostly learning from mistakes and your opponents' style. You have to calculate, and give thought, more so, than a dumb down AI match. Don't get me wrong, the AI is good, but is preprogramed and somewhat predictable, you will not find it so in MP. It seems the one who makes the least mistakes, wins, and the only way to find out, is try it yourself. It's tough to be on the losing end of a battle, you don't die, it helps prepare you with experience before going into another battle and pray that you do better.
Currently have 5 matches going on, although one those seems to have fallen off the face of the planet, I can only surmize that his English computer broke down.
If you truly want to have fun, join in on the MP lobby, I have an open challange there. If you are a first timer, look me up, if you want to get started, and get a feel for MP. Nothing gained, is nothing lost. There are some strong players out there, beleive me, alot better than I am, they will make you think twice, if not three times about your next move.