“Old Guy” feels familiar and predictable at times, though it remains reasonably entertaining as an action movie. It’s true that the film relies on well-worn plot devices and doesn't offer much in the way of fresh ideas. However, the movie largely succeeds thanks to Christoph Waltz’s acting. I enjoy Waltz’s work, and his portrayal of a rough but appealing assassin who also possesses a sense of morality, however faded, propels the story along. The film benefits from a feeling similar to "Lock Stock and Two Smoking Barrels." British filmmakers seem to understand how to create gritty crime action movies that feel believable and captivating—something American filmmakers often miss. The characters are well-developed, displaying both brutality and humanity; for instance, the scene involving the crime boss's father, the assassins, and his young granddaughter is a good example of this. However, some elements don’t quite work as intended. I didn’t find the jokes about him being an older man and womanizer to be funny, nor did I care for the odd, gender-bending apprentice assassin—apparently meant to stand in contrast to Waltz's traditionally masculine character. He abstains from alcohol, favors pink sweaters, and has black nail polish. It doesn’t succeed as a comedic device, at least not for me. Lucy Liu’s performance also felt unremarkable. Ultimately, “Old Guy” is an uneven film. It could have been stronger with a less conventional approach, but in my opinion, there's much to appreciate about it. I would recommend checking it out.

Source on TMDB