they did an amazing job keeping it super intense and interesting for the whole movie though, all the visions, loosing his sanity, and basically showing very well what it would feel like to be in that situation.
it starts out in an upbeat mood then suddenly he's fucked, and it slowly gets worse and worse, and more depressing and crazy, then the last 15 minutes or so is intense as hell.
i thought it was an amazing movie, and nomatter if you think the guys an idiot or not (i happen to not think he's an idiot, just willingly taking an extra risk) it is probably the best movie out there that shows what its like to be in a situation like that, and what the body can go through and our will to survive.