I searched far and wide for ranked lists of all Marvel Cinematic Movies that have come out so far. Criteria included the movies being ranked, not just listed, and covering all 32. The lists were generally created by groups, whether teams or committees or based on general public voting (like Ranker.com).

I was able to find 31 lists. I took the 31 lists and added all their content into a spreadsheet, noting the rank of every film. Then I averaged the rankings each movie got to find the overall ranking. The lowest score meant a high ranking average on many lists. The complete spreadsheet is attached at the bottom.

Here are links to the lists I used: