"The Lutherans teach and believe, that we are saved by faith alone, without any regard to works. They maintain this doctrine as firmly as though works were not at all necessary; yea, that faith is of such a nature that no work can be suffered or allowed beside it."
The rest of Menno Simons' treatise is well worth reading (http://www.mennosimons.net/ft024-lutheranbelief.html).
It would appear that the reverand Menno is not overly keen on properly understanding Lutheran doctrine. Had he spent a few more pious and devoted hours in the Apology for Augsburg, Smalcald Articles.... perhaps Luther's treatise on Christian Liberty, he would have ommitted the false accusation that the Lutherans have no time for good works. But as this quotation seems to imply, Menno would have it that the Lutherans add good works to their doctrine of justification. And not only is such an addition a severe categorical error, it is also heresy. Rightly then did the Augsburg confession denounce the Anabaptists as pious frauds.
I am a Mennonite myself, born of pure blood Mennonite parents into a Mennonite Brethren community. But all of this is absolute rubbish compared to the ineffable gospel of God's powerful and rich grace. I am convinced that Luther and Melanchton grasped this gospel in ways that precious few have, and so if anyone has an issue with these two fellas, they have an issue with me.