Moriarty’s fake return was the best thing about Sherlock season 4, which puts into perspective how flawed the show’s final season was. While there is always a chance that Sherlock season 5 might happen at some point, “The Final Problem” is currently the end of the show. With a 48% score on Rotten Tomatoes, Sherlock’s season 4 finale is among the worst-received episodes of the show for a variety of reasons. It’s fair to say Sherlock’s final two years never lived up to its two first, with the final season being particularly underwhelming.

https://screenrant.com/sherlock-season-4-episode-3-moriarty-return-fake-bad-op-ed/