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No mmo has come close, not even DAoC. People used to group up constantly. I remember when I played in the headstart back in 04, I grouped up from level 2 onwards. People just did, all the time. There wasn't even a trinity most of the time. The ideas of the task force, and instanced missions got old after a while, but now that I think on it, it's a kind of content that all MMOs should have to some degree.
You didn't have to group in the game, but people just did. Maybe because it was faster, maybe because it was safer, maybe you wanted to show off how good your build was at decimating enemies. Other mmo's have become solo games with chat rooms. I'm late to the party, but I'm starting to feel like this genre is doomed.