Director Tony Scott has developed a unique style, featuring frenetic hand-cranked multi-shot saturated-color imagery (see the short "Agent Orange" for a PG introduction). This is often poured on thick during high-action, high-stress, and/or high-violence scenes. Know this before watching, as it may be too much for some viewers.
This is a revenge movie. It isn't happy, though characters grow, repent and redeem themselves. The story arc is dramatic as a haunted bodyguard learns to live & love again, only to fail his job, and in revenge proceed to eliminate everyone involved (how that ends may be predictable, but is dramatic).
In stark contrast to, say Shoot 'Em Up, the action herein is believable - perhaps too believable for some tastes. The hero is not impervious to temptation, frustration, nor bullets, and I don't mean idealized versions of any of them.
Well done for a visually stunning tragedy.