Supernatural, which aired from 2005 to 2020, developed a dedicated fanbase over its 15 seasons and 327 episodes. While the series is celebrated, it also faces criticism, leading to several unpopular yet fair opinions. One notable point is that the monster-of-the-week episodes often provided more engaging storytelling than the overarching plots involving cosmic threats. Castiel, introduced in season 4, initially added depth but later became a crutch that weakened the Winchester brothers' roles. Despite some fans lamenting the loss of horror elements after season 5, many argue that the later seasons brought a fresh perspective, leaning into humor and self-awareness, which celebrated the fandom. Additionally, several villains, such as Crowley and Rowena, were crafted with complexity that sometimes made them more compelling than the protagonists. The series finale, while controversial, was deemed a fitting end, reflecting the show's core themes of danger in hunting, as exemplified by Dean's death at the hands of a vampire. Ultimately, Supernatural's lengthy run allowed for character evolution and narrative exploration that might not have occurred in a shorter series.