That's one of the reasons Martin Luther hated it so much. (Wikipedia: Luther's canon)
Here's a quote about Esther from Martin Luther's "On the Jews and their lies":
Oh, how fond they are of the book of Esther, which is so beautifully attuned to their bloodthirsty, vengeful, murderous yearning and hope. The sun has never shone on a more bloodthirsty and vengeful people than they are who imagine that they are God's people who have been commissioned and commanded to murder and to slay the Gentiles. In fact, the most important thing that they expect of their Messiah is that he will murder and kill the entire world with their sword. They treated us Christians in this manner at the very beginning through out all the world. They would still like to do this if they had the power, and often enough have made the attempt, for which they have got their snouts boxed lustily.