By all accounts, King Henry IV is good natured, friendly, and generous, making him one of the most loved French kings. Even after the French Revolution, his statue will be the first to be rebuilt. It's noteworthy that he's one of the few monarchs to really recognize the fundamentally economic nature of the needs and concerns of the average working person in France.
At the same time, however, Henry IV is also one of the most hated French kings: he used to be a Protestant Huguenot and converted back to Catholicism in order to end the French Wars of Religion and take the throne. Today's assassination is the third time a Catholic fanatic has tried to murder him, and if it hadn't succeeded, there certainly would have been more.