It would be GunZ, by MAIET Entertainment on the Ijji website, or at least I hope it would be. It could have downloadable levels through the WiiWare service and a real adventure mode. For those not familiar with it, here is the Wikipedia page:

http://en.wikipedia.org/wiki/GunZ_The_Duel

I think the Wii would be able to run its graphics and I think it would be much more fun with a controller instead of a keyboard. It could be GameCube / Classic Controller compatible if the Wiimote wouldn't fit. That's the great thing about choices.

It wouldn't even have to be completely online, but it has great lobbies and ease in traversing servers and what not so the online should be there. 

Your MMO game? 

ive played gunz alot its a very fun and addicting game

 Yea it was. I got all the way to level 20 and quit. Mainly because I didn't want to get real G coins. That took away all the incentive I had to play it. My plain clothes were wack. Plus, I was just getting bored in general.

Great game, but a pretty steep learning curve. It works best with a mouse and keyboard; using a controller just sucks.

You "think" it could run it's graphics? There are some ps2 games that look better.I love the game btw , but would rather something new.

I was just being modest. Better than "this game will pwn ,Warcraft SUXXORSZ....." I guess you are right about the new part, but I wasn't trying to imagine a new MMO on the Wii (take too long). I wanted to post while the MMO idea was still in my head, and I used game you might recognize.

 Well something new similar to gunz would be good.

No!

Because it would be Monster Hunter 3, plus gunz is lame and broken as it's hard to get around lamoid dagger users.