It's only 2-3 hours long but you're going to remember them well. This game did something I thought was impossible - make co-op with strangers a playable experience. Not only is it playable, it's magical. It's very tough to put into words the feeling of journeying with a completely anonymous stranger when your only way of communication is through what is essentially chirping.
I played through the game a couple times and both had their unique moments. If like me you're sick of today's focus on realism and cover shooters, definitely check this out for a breath of fresh air.
Journey is the only game I found worthwhile. The game still gives three interesting titles that are worth playing in the idea that they approach games as art. While unique, I would say play other full disc title first instead.