That's not his legacy. That's the revolution legacy. Napoleon is the sad conclusion to it. His main achievement is showing through his conquests that the old great European powers were no more and by that setting the stage for the European modern states. As the man, there is nothing to celebrate in his legacy. He is very liked by some proto-fascists in France however who would much rather attribute to a providencial man the achievements which were actually made by the constitutional assembly and the republics that followed him.