One need only read Luther’s books about the Jews to see what an incredibly flawed man he was.
Ah, the ad hominem argument, the last resort of the frustrated debater.
Yes, he was “incredibly flawed,” neither impeccable nor infallible ... but still by magnitudes a better student of the Holy Scriptures than any pope. By the way, which human being would you like to suggest isn’t “incredibly flawed”? I think that’s why God, who so loved the world, sent His only begotten Son.
Ironically, Luther agreed with you about his own character. His (nearly) last words were: "We are all beggars, it is true." I couldn't agree more. How good then that God so loved the world that He gave His only begotten Son that whoever believes in Him should not perish but have eternal life." Thus:
SOLI DEO GLORIA