The concept of time travel holds promise—when handled with care and attention to detail. However, Looper falls short in this regard. It seems the filmmakers struggled to establish a consistent vision for the film, unsure of its intended rhythm and tone. Consequently, the movie feels like a missed opportunity. There were moments where promising ideas, characters, scenarios, and plot threads emerged, but they weren't fully explored or realized. This is more disheartening than if there had been nothing worthwhile to begin with. The film squanders possibilities—a frustrating cycle in itself.

Source on TMDB