For me its:
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Ultima Online
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Final Fantasy XI
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Ragnarok Online
UO was a game I just recently discovered and it's fantastic, best sandbox experience I've ever had in a game.
FFXI was another recent discovery. It took the formula from Everquest and made it better. The game is even less grindy today with the QOL changes.
RO was a big part of my teenage years. I love the look of the game, it reminds me of Final Fantasy Tactics. It's a great casual game to just pop into and grind out some levels or explore.
FFXIV, Guild Wars 1 and 2.
FFXIV the only one I still play. I own GW2 Secrets of the Obscure, but I dunno if I'll ever bother to play it.
If you play for the story, Secrets of the Obscure will make you quit GW2 for good.
Yeah, I haven't heard great things. I'm hesitant.