They don't give movies any scores. They combine all other critics to create an average score.
I actually I would argue that Rotten Tomatoes holds infinitely more weight than the Oscars, whereas Rotten Tomatoes is actually based on community consensus, the Oscars basically boils down to which studio can run the best publicity campaign and which film's theme is "Oscar-appropriate"
But I digress, my point is that there is no way you can put House of Flying Daggers and Babe on the same list as Meet the Spartans
High Society and Citizen Kane. Don't start saying 'Citizen Kane was the beginning of symbolism and revolutionising filmic techniques!' because this is true. The story, however, is utterly awful, and Orson Welles quite frankly looks like an overweight toad. The characters are not endearing or at least polarising, just bland and boring. Studying this film was like watching dead grass grow. I can't get over it: I nominate it as one of My Top 10 Worst Movies ever. High Society is bad even for an old-fashioned film: it's not THAT awful but it sure is a drag to watch. Date Movie/Night (the one where a fat hairy lady gets turned pretty) is absolutely awful, too. Plus most preschool children's movies.
and Orson Welles quite frankly looks like an overweight toad.