Plot - good. Acting game - good. Mixing between past and present - also a good idea. So there're pretty good things about the movie. But the main problem is that the film is somehow slow (even though it's only 90 minutes) and the last half an hour was boring. I wouldn't watch it again but I don't regret spending time on it so I would say the IMDb raiting is definitely too low.
Review of Adrift
