In terms of entertainment value, Castillo represented the "Bold" era of Philippine cinema. This was a period defined by the loosening of moral censorship and the commercial imperative to sell sensuality. However, unlike contemporaries who relied solely on titillation, Castillo brought a certain freshness and accessibility to her roles. She was often cast in roles that leveraged her provincial charm and striking beauty, making her a relatable fantasy for the masses. Her filmography, which includes significant works like the controversial Mga Kwento ni Lola Basyang segment "Ang Mahiwagang Biyulin," showcased her range within the entertainment spectrum—capable of navigating fantasy, drama, and romance. She was a fixture in the "Regal Shocker" and teen romance genres, cementing her status as a pop culture staple of the decade.