Killerman sucks. It's boring. It's long. It lacks personality. Nothing of any interest happens until the last 30-40 minutes of the film. It's a hollow exercise in "gritty" crime filmmaking—meaningless images of scummy, greasy people doing bad things, in dumpy environments, on grainy 16mm film (for extra "style").
Killerman is about Moe Diamond (Liam Hemsworth), a New York City money launderer who gets injured in a deal gone bad. His injury leaves him an amnesiac, unable to recall who he is, what he does, or why he has two duffel bags of stolen cocaine and one of stolen cash. His one apparent friend, Skunk (Emory Cohen), attempts to help him figure out who he is, though not without manipulating him into believing he's a drug dealer who has been caught in the middle of something bigger. The "caught in the middle of something bigger" part isn't a lie; Moe's coke and money belong to Skunk's drug kingpin uncle Perico. It's also the target of two corrupt police offiicers hell-bent on retrieving it.
That's about all that matters in the film. It's a lot of Moe running away from the two cops, some scenes of Skunk getting beaten up, and a little bit of Moe screaming and crying about his identity. But mostly it's just running from cops. It all feels like clippings from other violent crime dramas, pieced together into a bland, character-devoid "story" that feels more like an excuse to let actors play tough guys and shoot each other than an actual movie.
It's got one near-positive: Hemsworth. He gives maybe his best performance to date. (Good job, Liam!) Unfortunately, it's entirely wasted on a character with no personality and hardly any lines. The problem, in this case, with the amnesiac premise, is that we are given essentially no more information about what kind of person Moe is than what he knows about himself. We don't really experience any of his life prior to the incident until he's revisiting it himself, attempting to piece his life together from tiny shreds of information that other people give him. Perhaps this could have been remedied with a distinct, eccentric personality reflected through his dialogue, but instead, his is mostly perfunctory. So we have no one to attach to, and, as such, all this screaming and demanding and beating people up and having sex with a random woman in a bathroom add up to quite the incoherent 2-hour slog.
There isn't much else to say. Killerman is an empty movie. I don't know what director Malik Bader thought he was going for; but I'm pretty sure he missed his mark. Just don't waste your time on this one.