It kept my attention at least. (spoilers)
I can't say it was a truly bad movie because it did keep me interested but it made no sense that they had constant amnesia and couldn't remember where they lived or who they were and yet they still knew how to do just about everything else. They knew how to open cans, they know how to eat, some knew how to make fire, they have a perfect understanding of the English language, etc.
It was also hard to relate to the characters because they sort of disappeared after 24 hours and woke up a different person.
I didn't understand either how the family that lived in a protected area could have constant supplies and endless energy to power the place.
Finally it had one of those endings without any resolution. Basically cut to black in the middle of a scene and it's just over. The one excuse that I have heard for these types of endings are "You have to use your imagination". Well if I have to make up an ending I might just as well make up the whole movie. I don't want to make up a whole movie nor an ending. After investing time and connection with the characters, I expect a resolution and I don't think that's being unreasonable. I wish these types of movies came with a sticker that said "No real ending". Then I'd at least know what I was getting into.
No disrespect to others who don't mind those types of endings, it's just not for me.