MMOs on Boot Camp (Vista)?

I have a 17" 2.0ghz, 2GB Ram iMac. Not sure if you need more info than that as I'm pretty much a computer newbie.

Anyways, I have Vista Home Premium Boot Camped and was wondering what mmo's you guys might play that works well with this set up. I played EQ2 with the settings down, which I didn't mind, but was not a big fan of that game. EVE Online was ok, the performance was pretty good. But then I tried my favorite mmo, Guild Wars, and it was just awful on my machine. Don't know why.

Is it because this is not a native Windows machine or something? Again, I'm a computer newbie and don't know how it works or what to look for in regards to compatibility. I would love to try Lord of the Rings Online but don't know how it would perform on my machine.

Thanks for any help.

I played LOTRO on my 20" iMac 2.16ghz w/ only 128mb of VRAM and 2gb of RAM... It played REALLY well at Medium Settings... Though I was playing it on Boot Camped XP which isn't near the resource hog Vista is.