It could have been a very good 4 hour long movie. But it was rushed at the end, and seemed a little inconclusive. Of course, people don't want to sit in a theatre for 4 hours. I watched it at home and enjoyed it for the 2 hours I rented it.
The movie doesn't really start till you get to the lifeboat. Prior to that, its a long wait through a boring script. The lifeboat was interesting, reminded me of Cast Away, where the scenery was quite blissful to take in. Ver relaxing to see the different ocean scenes.