Played it, back when it was in closed beta.
Even though, it requires a beast of a machine to run smoothly on higher settings, i had a blast.
It´s not your typical roleplay game, in wich you just mindlessly kill stereotype villains, over and over again.
It actually has a rather decent storyline, compared to other mmorpgs and some of the hardest puzzles/riddles i´ve ever encountered in a videogame.
I´d highly recommend it over any other game of this kind.