Yes, for all of his later faults, Martin Luther delivered all of us, even the Roman Catholics, from the corruption of the early Roman Catholic Church. The selling of indulgences and the maintenance of the poor in ignorance of the scriptures.
All have profited from this man. The present day Roman Catholic Church would not be as "human" today were it not for the Reformation.
I believe there were many people working for reform in the Church, some stayed and some did not.