Is its good? I wanted to see it really badly... at one point.
It's a girl stuck on a rock being hunted by a shark. I'm not sure how to rate or rank it! Lively does a good job. It has interesting moments. I wasn't bored. I enjoyed how they got around the dialogue need -- she tends her wounds while talking to herself as if she were a patient (she's a medical student, which is handy).
Also interesting is that they avoid showing the shark. So when the shark strikes, we go close-up to Lively's reaction shot, then cut back for the gory results of whatever happened.
It's good, but probably not worth going out of your way to watch. Get Nice Guys in you instead!