If you havent played UO, you have missed something. But I am not sure, if it will satisfy todays demand on MMORPGs.
There had (some still have) been some great real role playing shared, where talking too much OOC got you kicked off the servers

. You had a chance to really play another character (not just you with an avatar) and try to change or dominate the world

. It was one of the few games in which there were players which didnt even had the skills to fight a higher monster even after years of playing, because just playing the characters with interaction with others or following the path of an trademan, was already fun enough for them.
Its really a pitty the investors of Wish didnt give that game the chance to follow up the great idea of UO (it was the only modern MMORPG I know off which had the same skill system with learning by doing as UO).