When it comes to The Lord of the Rings trilogy, I don't think I've ever known a single person who's said that the second movie, The Lord of the Rings: The Two Towers, is the best movie in the trilogy. In fact, when I ranked all of the Rings movies, I put it right above the three Hobbit flicks.
Middle movies in beloved trilogies are sometimes the best films in the entire series. Case in point: the original Star Wars trilogy. Just ask anybody (or ask us), The Empire Strikes Back is the best Star Wars movie. The Dark Knight is also the best Batman movie in Nolan's trilogy, and many would argue that The Godfather Part II just narrowly edges out the first movie.