New World.
Started off as a PvP mmo with a focus on territory control with some survival elements. Not a traditonal mmo to be sure, but definitely an interesting concept.
Turned into a generic themepark PvE mmo but with none on the features one would expect from a modern mmo.
Its gotten better since, but AGS tends to drop the ball just a little more with each update.
I peaced out about 3 months after release, tried it again a year later and even with improvements it still couldn't snag me. I just found myself longing for the original concept.