It's for the PC, but Troika's Arcanum is in my opinion the best open end RPG ever made.
The game is filled with bugs, but there's a fanmade patch online that deals with that all. The game itself, the storylines, the world, the interaction. Everything is just -so- good. And the graphics aren't too bad, play it for an hour or two and you won't notice it at all anymore. The game has many endings, many ways to play it. It's even possible (though not recommendable) to finish the game with only killing 3 things in the entire game. Ie. play passively. But don't try it unless you're familiar with it.
Then there's evil/good, Magic/tech and just about everything inbetween. Play as a lone gentleman gunslinger. Or a robed-up charismatic magician with his many followers spewing out balls of fire.
Totally worth a go, in my opinion. One of a kind. <3