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I've tried quite a few of 'em. Lots of games, like Wow, Lotro, etc., have a good amount of solo content but the closer you get to the endgame, the less there is to do solo. Even CoH (which I loved) that had scaling, post 40 had so many quests with AVs that you needed to group often.
I've teamed, I've raided, and so forth, and yes, I had some good times (and some bad) doing so. What I am sick of, is being able to solo most of a game, then being forced to team with others by the end of it.
I want to see and experience ALL (or 95%) of the content without ever being forced to group to do so. I want an MMO with soloable instances!
I know I can play SP games, and I have played a boatload, but even for diehard soloers, MMOs offer many things that cannot be found in offline games.
Finally, I don't care much for PvP. I tried EVE, and while it had some cool things, way too much ganking there for my tastes.
So, does such an MMO exist?
MMOs I've played and can remember: UO, EQ2, AC, EvE, CoH, Wow, Lotro, 2Moons, 9Dragons, Mythos, TR, Ryzom, .... I'm sure there's more.