I played God of War last year (and replying it now since I turned a friend of mine onto it) and from what I hear, it's about 10 hours. But playing it again and being able to gage my time now, This game is massive not just in amount of time but in depth. Almost like you have to think of it in 4-D. I think this is partly because the story is very involving, you learn these really awesome moves, the cinematic presentation of the game, especially when the music cue's up based on the intensity of the action. I could go on but suffice it to say, it's like opening a small trinket box and you fall into an epic adventure.

I would akin it to being the secret spice that makes an ordinary dish Great.