Agreed. I've always thought that the plot is a thin mashup of Thor and Cap 1 held together by Gal and Pine's chemistry and the No Man's Land scene. Personally I wouldn't have put Superman: The Movie at # 1 either but I can certainly respect it for being the blueprint for successfully making a comic book property into a blockbuster.
Blade and TMNT probably have more business being on there than Super.
Batman 89 is another one like Superman: The Movie for me. It's not my personal favorite but it deserves a spot at the table for how important it was for the genre.