That's actually my top (bottom 3) right now as it stands. Kudos on not letting up on those pre-VII popes who allowed much of the rot to fester before it exploded. No one beats PVI or JPII in terms of the implementation and popularization of VII.
This is refreshing. I was expecting to be challenged on Pius XII, Benedict XV, etc. Pius XII was the watershed into Vatican II. He appointed the vast majority of the Bishops who brought the world Vatican II, opened the door for evolution, NFP as birth control, and set up Bugnini to start his liturgical experimentations. Benedict XV immediately dismantled the anti-Modernist apparatus put in place by St. Pius X, getting rid of Cardinal del Val and others, disbanding the Sodalitium
. Pius XI was a diplomatic who also played nice with Modernists, and who betrayed the Cristeros. At the bottom of this list is Alexander VI, who defiled the papacy with his sordid personal life ... but at least he didn't pollute doctrine.