I can only comment as an observer. Never got into MMO's (despite my brothers egging me on at times) because I didn't really like the feel of the game as a whole. Raiding, for example, didn't appeal to me at all for the same reason I hate team games in class; if I fuck up, I should deal with the consequences. For this reason, I always stuck mainly to playing FPS' online, Halo, Call of Duty, Bad Company 2: Even if you were on a team, you weren't expected to coordinate too much, and unless you were doing absolutely awful, you were overall a positive force for the team, and besides, I always gravitated to sniping, so I was a loner anyway.
So, again, I comment as an observer. My brothers play WoW (and not TOR); my brothers' roommates play WoW. Just twenty feet above me, 5 guys are probably playing an MMO (some WoW, some TOR, some others I don't know). I don't know the two roommates that well, but that still leaves me with three samples, my brothers, and I find a nice gradient there.
I have one brother who is really laid back about MMOs. I remember asking if he wanted to play Trine or watch a movie or something (my computer can't run Trine, whereas his can on max settings and by God that game is gorgeous but I digress), and he said, "I've got a raid in just a bit... Oh well, fuck it." The guild he's in, with my other brothers and their roommates, are pretty chill about it, so whatevs, they're cool about it.
Another brother, who I guess is pretty laid back as well, but I'd call him the intermediate because the only games he plays are primarily MMO's, or at least moreso than the brother above. As I said, he's not uptight about WoW (I'll occasionally say WoW instead of MMO's because I find it more comfortable to type), just moreso than the other.
And the final brother. Fucking Christ I actually worry about him. He's just a year older than I. My freshman year of High School, he got sick and stayed downstairs playing WoW with my brothers instead of going to school. He claims to have been sick the whole time (the whole time being January to nearly the end of the school year), and during that time I think he got addicted to the fucking thing. He had played it earlier, but not to such and extent, and not so fervently. He dropped out of school and basically browses the internet and plays WoW all day. He gets frustrated when people can't find the time to raid because of some altruistic bullshit (who cares if they don't want to or can't to it, we need a healer). He gets pissy at family gatherings because he's "got a raid at six," neverminding that he knew we'd be going to the gathering ahead of time and should have planned the raid around that, not vice versa.