Martin Luther was one of the most polarizing figures in all of Reformation history; and a man full of complexities (I often refer to him as the “ever mercurial” Luther). But the more you read this theologian’s thoughts (which were very avant-garde for the hostile times in which he lived), and also the impressions and opinions of his detractors, a full orbed view of this larger than life person starts to materialize. One thing is for sure: one would never find Martin Luther commonplace. Although, I suspect, that is how he found himself best suited.
A free biography of Martin Luther is available at: http://www.desiringgod.org/blog/posts/martin-luther-biography