I love fight movies in general- whether it be individuals or war and such- but there's something about survival stories that really no other movie comes close to displaying. Sheer, potent, willpower. Not only that, but their lives are practical and instructive. They aren't flamboyant, unrealistic heroes that you can idolize, but never emulate. These are human beings in impossible or extremely trying circumstances that show you it's possible to overcome unbelievable odds.
I'm also a huge fan of resourcefulness. In some of these survival stories, you see that the survivors- often left to the wilds or the extremes of nature with very little in the way of immediately applicable survival gear- fashion their own means of survival. I'm not sure if it's brilliance or simply willful determination behind it, but it's just some of the most awesome little pieces of human gusto I've never seen.