Final Fantasy XI
Not so long ago I came back after over 6 months of break and started playing. Man, I forgot how tough it can be, especially leveling up. It can be really slow but things start to speed up at high level (60+). The battle with skillchain, magic effect, etc. are rather impressive and better than what I've seen in any other mmorpg.
There's ton to do but does take alot of your time so beware. Too bad you can't really solo everything so you have to depend on finding a party and work things out like doing some missions, or certain quests to unleash more and deeper storyline. Rumors that Odin and Alexender will be seen/told in upcoming expansion this fall.
Only if Square-Enix is going to enhance the graphics for high end PC but probably never going to happen.
This mmorpg isn't for everyone so, might want to try it out and see with free 30 days trial.