I don't really like any of mine, but I have plenty of least favorites.
All of my countdown lists are awful, mostly because I decided to do them all at the same darn time, causing major burnout, and the reviews themselves were a mess.
At the same time, however, my first countdown, where I ranked every pre-movie episode from least favorite to favorite, is salvageable. I may make a remastered version of that list someday.