The Episcopal Church places Martin Luther on their Liturgical Calender (Feb. 18). Here's a web page noting what those in the Episcopal Church are to pray on that day:
O God, our refuge and our strength, who didst raise up thy servant Martin Luther to reform and renew thy Church in the light of thy word: Defend and purify the Church in our own day and grant that, through faith, we may boldly proclaim the riches of thy grace, which thou hast made known in Jesus Christ our Savior, who, with thee and the Holy Spirit, liveth and reigneth, one God, now and for ever.Calvin also makes it on the calender, as does Loyola, Newman, and Barth.
Contrarily, here's the flip side, a website entitled, List of Most Evil People of the Last 2000 Years. Luther makes this list, as does John Calvin and Loyola. Barth and Newman though failed to make the list.