Its just a really great RPG. Because it is set over a year and a lot of it tends to revolve around the normal lives of the characters you get to know them a lot more than you would other games and become invested in their lives. All the parts of the game, combat, story etc are good but for me it was the investment in those characters that kept me going and is probably why its now one of my favourite games of all time. Once I get my Playstation TV later this year I'm planning on playing it through yet again which should be my fourth playthrough I think of a 100+ hour game.