Indeed, the Church was in bad shape and there were bad actors that needed to be exposed, but does that mean all Her doctrines needed to be turned about? He re-wrote Scripture to convince some people there was a shortcut to salvation. All by himself, without the aid of Councils, Synods, etc. Infallible teaching that was universally accepted by all of Christendom for 1400 years he changed in a few months. Ridiculous.
One thing Luther did do. He helped many break the chains of the Catholic cult.