I hated EverQuest. You spend about 8 months levelling your character up to the point where you can actually go anywhere. After every battle there is a significant amount of downtime require for getting you hp and mana up. It's just a very slow game.

I personally like Ultima Online a lot, but it's quite outdated these days. Cheap, yes, but out-dated. And everything is more item based now, on OSI servers, so if you like Diablo, you'd probably like current UO.

SWG was a decent game, but still a lot of wait time.

Same with DAoC. So it really depends on what you want.

Current UO is probably closest to Diablo.

My mom has played pretty much all of the MMORPG's out, and she prefers Asheron's Call 2 right now.

I've been mostly stuck on UO myself.

That's my .02