Understood, didn't consider that. I had a good time poking fun at all the plot holes in the Dark Knight films with friends, but I consider them good movies because the "holes" aren't necessarily distracting. From that perspective, as I said, I agree Looper was a good, entertaining movie.
I love movies with ambiguity (multiple, slightly imperfect ways of interpreting the narrative). The slight inconsistencies are key to those movies because you are supposed to be unsatisfied and unable to fully accept any one interpretation. For example, American Psycho (murderer/delusional) or 12 Monkeys (time-traveller/crazy person).
I don't think that Looper is ambiguous like that (a movie intended to rack your brain about). I suspect that the viewer was intended to dismiss the time travel mechanics debate and focus on the story (as future Joe suggests to present Joe in the diner). But I didn't notice the story go anywhere too deep, thematically, either. For that reason I'm surprised with the kind of praise it got (smart, thought-provoking, rather than good, entertaining). Again, I'll grant that I might have missed something (just my initial impression).
Steal my dreams and sell them back to me.....