I saw it in the theatre back in the day. The things that worked for me was actually that the first half was as dull as dirt and really wore me down, and the shakey-cam made me feel ill.
I was tired, I was uncomfortable and starting to feel sick, and I was getting sick and tired of those whiney little turds on screen who were stupid, and lost walking in circles, and ditched their own map, the dumb assholes. Then I sort of tweaked that my crappy experience at the movies was paralleling their crappy experience in the woods. They were lost, tired, and hungry. They were bickering because each one of them was getting sick and tired of the other two whiney little turds, and then that stupid asshole ditched their map! I hated the whiney movie and wanted it to end. They were hating their whiney selves and wanting to just go home.
So by the time things got weird in the movie, I was physically starting to really sympathize with them (feeling sick and tired). And by then, as an outdoorsy person, I was also starting to sympathize with the fact that there is a certian point in which “Boo-hoo, we’re lost and it sucks!” becomes “Oh shit, we’re lost to the point where we may actually be in jeopardy”.
When Josh started crying because “there’s blue goo on all my stuff”, I remember all the times I was so over-tired that when the dollop of toothpaste fell off my toothbrush, it almost brought me to tears.
The movie did work on a psychological level for me, because if the one guy was “taken” then why didn’t he put up a fight? (it’s not cool when you’re lost in the wilderness to slplit up. And how could the other two not have heard him leave? Did he leave willingly? Then why? Why didn’t he take any of his gear? Is that him in the woods? If he’s lost why isn’t he calling for help? Why not call Heather’s name too, he’s just calling Mike?
I though the end as effective even though I also thought “Good grief, this is like one of those bad stories you tell around a campfire with a flashlight under your chin: ‘And when they got home… there was a hook stuck in the car door!..’”
I’ve never rented it because it would suck on a small screen, and I really don’t care to sit through the long, exhausting trek through the woods again. And the pay off now, would totally read ike a campfire tale.