Simple yet sweet.

Game: Runescape

This has got to be the best mmorpg out there.
Yes the graphics may not be the best in the world, but they are still have a certain appeal to them.
We must also remember it is amazing to have done all this in java, for that alone runescape has already achieved a higher ranking than any other mmorpg.
There is a lot of variety in runescape, the huge selection of skills, quests, items and areas to choose from.
That isnt the end of it though, every month new features are added...
There are still many more improvements needed, mostly to do with community improvements, such as removing scammers, macroers, improving the chat feature etc.