The only MMORPG I've ever really played (as in, spent more than one part of a day) was Runescape. As much as I hate that game now, I used to really like it. I'm not sure why, maybe I just wanted that sense of accomplishment that I thought would come by reaching level 60 in mining, and all those other skills. Eventually I realized I was sitting at a computer all day clicking the same coloured group of rocks over and over again, and I immediately ran to my Xbox, popped in Halo, and started killing things.
In all seriousness, I've never gotten into MMORPGs because for one thing, they require an obscene amount of time and effort, mostly for grinding, and I find that to be really boring. Grinding is also the reason I dislike most RPGs. There's also the fact that they have a monthly payment, and I don't want to shell out that much money for something I'm probably going to drop in a week or so, when I can buy a single console game for much cheaper and enjoy it for a longer period of time. I've also realized most free MMORPGs are either crap, or they require monthly payments to actually get any of the good stuff (ie: Runescape) so I also lose interest in those rather quickly. There's also the people that you run into during those games, but I feel that if I start getting into that, I'll rant even longer than I already have.