Tommy Wiseau in "The Room" (2003): Wiseau's performance in this cult classic has been often cited as one of the worst in cinematic history, characterized by stilted delivery, awkward line readings, and bizarre facial expressions.
Hayden Christensen in "Star Wars: Episode II - Attack of the Clones" (2002) and "Star Wars: Episode III - Revenge of the Sith" (2005): Christensen's portrayal of Anakin Skywalker was heavily criticized for its wooden delivery and lack of emotional depth.
Kevin Costner in "Robin Hood: Prince of Thieves" (1991): Costner's attempt at an English accent and his overall lackluster performance as the titular character received widespread criticism, with many considering it one of his weakest roles.
Keanu Reeves in "Dracula" (1992): Reeves' performance as Jonathan Harker in Francis Ford Coppola's adaptation of Bram Stoker's novel was heavily criticized for his monotone delivery and lack of chemistry with his fellow actors.
Nicolas Cage in "The Wicker Man" (2006): Cage's over-the-top performance and infamous "Not the bees!" scene in this horror remake have become the stuff of internet memes, with many considering it one of his most unintentionally hilarious roles.
Kristen Stewart in the "Twilight" series (2008-2012): Stewart's portrayal of Bella Swan was criticized for her often expressionless acting and lack of charisma, with some viewers finding it difficult to connect with her character.
Arnold Schwarzenegger in "Batman & Robin" (1997): Schwarzenegger's portrayal of Mr. Freeze in this superhero film was widely panned for his campy performance and cringeworthy one-liners, contributing to the overall negative reception of the movie.
Shaq O'Neal in "Kazaam" (1996): O'Neal's performance as a rapping genie in this family comedy was heavily criticized for its lack of charisma and awkward delivery, making it one of the most infamous examples of celebrity casting gone wrong.