I will keep this simple and rational, not emotional like anyone else :
Cons :
1. VERY SLOW start and pacing. (First 10 minutes will REALLY test your patience).
2. Repetitive actions and dialogues. (80% of them are just monologues actually).
3. Plain and very straightfoward plot. (No surprise at all, suspense scenes aren't working well).
Pros :
1. Kinda realistic movie, or should I say a person with REALISTIC MIND. (Many people failed to undertand this one, it wants to show you how underwhelming your real life is, even as a killer. In fact keeping a low profile is vital for him, so no explosion or any big destruction).
2. Has it owns principles. (The repetitives monologues like "stick to the plan" and "no empathy" are two of his beliefs to keep killing people without giving a damn about people's feeling, not even law or god.)
In summary, I'm not saying this is a good movie. But still if you know (or want to know) what a realistic life as a principle killer is, definitely not the worst one. [5/10]