While there’s no mistake that fans of the movie series were happy to see this Nazgûl meet his ending, especially at the hands of Merry and Éowyn, others have issues with the way he was killed.
Regarding Idiopyrgus meriadoci, they write, "Besides standing with Éowyn against the Witch-king in the Battle of the Pelennor Fields, Merry is also an example of the fight for nature conservation ...