The phrase "great analogy" means that someone has made a comparison that helps explain one thing by comparing it to another thing in a clear and understandable way. Full definition
He goes on to say: «In some ways, there is greater analogy with Spinoza's modes» (SMW 70). (religion-online.org)
«almost as if we lived in the Middle Ages»... when the Vatican sanctioned and even encouraged Christians to go forth and slaughter Muslims by the thousand to «retake the holy land»... yea, great analogy bro. (religion.blogs.cnn.com)