Weird and real, it could be better, but
Ok,
This is a weird film, weird because it try to show real psychotic terror, 5 frightened girls trying to scape from something they don't understand why is it happening, trying to save their friends, and acting like regular girls would probably act in this kind of situation.
The abuse on the screams it's annoying but is what you would probably hear in a situation like this.
The way the camera is handled all the time inside the car, tring to make you feel claustrophobic, it's annoying but it's ok.
And in the end when they can't take it anymore, they finally decide to act based on their number superiority and end their terror.
there are plot holes, there are times you wish all of them die, but it is completely honest terror movie. It doesn't have people coming from nowhere and jumping on the screen to surprise you, and it doesn't fall to any of the cliches that terror movies are so full nowadays.
If it had like 4 times the budget it had, it would helped a lot. it's far from awesome, but it's far from a complete crap also.