This question is quite broad. Saying whether something was beneficial is a complicated question without making lots of value judgments. One group that benefited from Napoleon's conquest of much of Europe were Jews. Napoleon emancipated Jews, making them citizens rather than a weird separate resident class of people (often under a governmental charter). This began the process of integrating Jews into European societies, with far-reaching consequences. Though even there you could make a coherent argument that it wasn't beneficial.