While Robert Downey Jr. is best known for redefining superhero cinema with Iron Man, one of his most rewatchable and underrated performances came in a different kind of role — one that arguably showcases an even sharper mind. In Guy Ritchie’s 2009 Sherlock Holmes, Downey steps into the shoes of fiction’s most famous detective with charisma, intelligence, and surprising emotional depth.
With a strong IMDb rating of 7.6, Sherlock Holmes combines mystery, humor, and action in a way that keeps fans coming back. Ritchie’s dynamic direction visualizes Holmes’ thought process through clever editing and immersive sound design, pulling viewers directly into the detective’s mind.
Rather than adapting a specific Arthur Conan Doyle story, the film presents an original case involving Lord Blackwood (Mark Strong), blending classic Holmes traits — boxing, disguises, sharp wit — with modern cinematic flair. References to Holmes’ more obscure qualities, like his substance use and social awkwardness, ground the character in a gritty, believable world.

The heart of the film lies in the chemistry between Downey and Jude Law as Holmes and Watson. Their bickering, loyalty, and unspoken affection bring warmth and humor to the story. It’s a rare on-screen partnership that feels both genuine and endlessly fun to watch.
While the sequel leaned heavier into spectacle, the original strikes a near-perfect balance between action and mystery. Whether you're looking for a detective story, a buddy comedy, or a high-energy period piece, Sherlock Holmes delivers — and keeps delivering on repeat viewings.
Fresh off Iron Man, Downey brought creative energy and nuance to Holmes, making him more than just a quirky genius. He’s sharp, unpredictable, and impossible to look away from — making this role not just memorable, but endlessly rewatchable.