I personally found I did care about whether JGL did the right thing. But I have to admit that it took a lot of good faith investment on my part.
The remark above about how it might have worked much better as a short reminds me of what people who saw La Jetee before 12 Monkeys said.
The Kid Blue/Abe subplot is unresolved, but doesn't really add to the texture of the world depicted. And as is doesn't add anything thematically either.
There are so many scifi movies that are badly plotted, premises not thought out and based on a determination to enact clichés, though, that I tend rather to be grateful for the Loopers or Oblivions, despite their manifest imperfections.