Sherlock's Rotten Tomatoes Score Fell From

The BBC's Sherlock series saw its Rotten Tomatoes critics' score fall from 95% to 47% between its third and fourth seasons. A report by Screen Rant argues the show's decline began when it misapplied the lessons from its most acclaimed episode.

Sherlock, which aired from 2010 to 2017, reinvented Arthur Conan Doyle's detective for a modern setting. Its early success was built on balancing inventive mysteries with the developing friendship between Sherlock Holmes and John Watson.

The Peak and the Pivot

The show's creative peak is widely considered to be its second season, culminating in the finale "The Reichenbach Fall." That episode featured a brilliant cliffhanger where Sherlock seemingly died by suicide to save his friends from the villain Moriarty. The twist was effective because it served both the story and Sherlock's character, demonstrating his deep care for John, Lestrade, and Mrs. Hudson.

However, Screen Rant suggests the show took the wrong lesson from that success. It began treating every subsequent episode as if it needed its own massive, shocking reveal. This shift marked the beginning of a problem that would consume the series.

From Mystery to Mythology

By its third season, Sherlock became more interested in the mythology surrounding its hero than the mysteries he solved. Twists became bigger instead of smarter. The character of John's wife, Mary Watson, exemplified this change. She was not simply a love interest but was revealed to have a secret past as a former assassin, turning her into another puzzle box for the narrative.

The show was increasingly letting mysteries drive character, rather than letting character drive mystery. The season 3 finale, "His Last Vow," seemed desperate to top "The Reichenbach Fall." It featured an ending where the villain's vast blackmail vaults existed only in his mind, a reveal that felt designed to shock rather than reward viewers.

The Convoluted Conclusion

Season 4 doubled down on this approach. Secret siblings, childhood trauma, and convoluted mind games took center stage. The finale, "The Final Problem," centered on Sherlock unraveling a series of bizarre psychological challenges designed by his previously unknown secret sister, Eurus.

The result was one of Sherlock's most divisive episodes. Its constant twists and emotional revelations left many critics and viewers frustrated. The show spent two seasons trying to recreate another "Reichenbach Fall" moment. It ultimately proved that a twist is only as good as the story and characters supporting it.

Despite the divisive final seasons, the report notes Sherlock remains beloved for its early demonstration of how thrilling modern Holmes adaptations can be. The series was led by showrunner Steven Moffat and aired on BBC One.