[2] Pedro J. Ramírez hired him to work for Diario 16, and after the newspaper's closure, Boyero joined El Mundo.
In 2008, a letter signed by Víctor Erice, José Luis Guerin, Miguel Marías [es], and Álvaro Arroba was sent to El País "severely" questioning Boyero's activity as a film critic.
It had support from the likes of filmmakers Chantal Akerman, Lisandro Alonso, Mercedes Álvares [es], Isaki Lacuesta, film critics such as Carlos Losilla, Àngel Quintana, Santos Zunzunegui, Gonzalo de Lucas, José Manuel López, Carlos Reviriego and Xavi Serra and other film personalities such as Filmoteca Española director, Antonio Santamarina and producer Luis Miñarro.
[10] According to Manuel J. Lombardo his detractors revile "his disdain for the new, his egotistical haughtiness, his immovable classical tastes, and his laziness for discovery".
[3] His comments disparaging Jodie Foster's physical looks in 2024 during a negative review of True Detective: Night Country also attracted public examination and scrutiny.