Shuttle does a good job of keeping you interested considering how thin and predictable the storyline is. I kept waiting for the twist people talk about but there isn't one. When the movie was over I kept thinking 'Is that it?'.
There are some impressive gore moments which will make you cringe. You will also cringe at the stupidty of the girls in this movie...it's kind of hard to have any sympathy although shouting at them does keep you involved in this thriller.