Firstly, I'm not giving this a rating on account of my early attempts to watch it, I don't remember what happened exactly; for some reason or another I couldn't concentrate much, eventually finding out what happens before giving it a "normal" viewing, therefore I knew what happened already and can't say whether the suspense aspects worked or not.
Anyway, four people who really aren't terribly charismatic cruise down a road until the driver takes whats apparently a shortcut, but isn't, because their car breaks down.
The driver's brother proves himself an obnoxious type when a bear attacks, and he fires every bullet he has into the critter, killing it but leaving himself out of ammunition. Maybe he thought the others carried guns, perhaps he thought more bears couldn't possibly be where he already encountered one.
Before long the others display annoying traits. However, there are some minor occurrences, for example one girl opening a present intended as an anniversary gift the boys intended for their parents, when she gets cold (it contained a blanket) which surprises the other girl.
More occurrences where characters apparently notice stuff about each other happen. This subtlety is appreciated, although the characters themselves aren't too likable. It certainly tries for suspense and character focus. The result might depend on how much the viewer can invest emotionally in the characters.
