I figured there were more reasons. It appears to me that Luther was a great man, regardless of what some may say, but I wonder if he would be spinning in his grave, if he knew people would use his name, as a denominational name? Somehow, I doubt he ever had that in mind, and I am pretty sure he would not approve at all.
He was one of others who dissented from Rome in critical areas out of conscious toward God, and continued to proactively oppose Rome out of doctrinal convictions, but did so at a time of God's design which had profound effects, which Luther had not himself planned.
However, his role in the Peasants War , and esp. his latter exasperation and vindictive invectives against the Jews (but see also popes against the Jews ), in addition to his retaining some errors of Cath. tradition, impugn his status.
But as a result of the primary Reformation distinctive, that of Scripture being the supreme authority as the wholly inspired and accurate word of God (which liberal Prots effectively deny), few Prots know much about him or care. If fact, not thinking of men above that which is written, (1Co. 4:6) while violated by some, has gone to the other extreme in which few Prots know much about such notable evangelicals.
Maybe a series on such would be fitting someday.