Suggestions by @bobby789

James Caan

as Caledon Hockley in Titanic (1977)

Score: +2

John Travolta

as Iron Man in Quentin Tarantino's Avengers

Score: +5

Margot Robbie

as Black Widow in Quentin Tarantino's Avengers

Score: +3

Tom Green

as Andy Kaufman in Man on the Moon

Score: +1

Mark Wahlberg

as Jerry Lawler in Man on the Moon

Score: +2

Conan O'Brien

as David Letterman in Man on the Moon

Score: +1

Charles Rocket

as Sherlock Holmes in Holmes and Watson (1997)

Score: +1

Rowan Atkinson

as Sherlock Holmes in Holmes and Watson (1997)

Score: +3

John Cleese

as John H. Watson in Holmes and Watson (1997)

Score: +2

Michael J. Fox

as Milton in Dreamworks' The Bad Guys

Score: +3

Bruno Mars

as Michael Jackson in Musicians Biopics

Score: +3

Nicolas Cage

as Superman in Injustice (2000)

Score: +1

Lil Nas X

as Michael Jackson in Musicians Biopics

Score: -2

Robert Shaw

as Jack Torrance in The Shining (1970)

Score: +7

Bruce Willis

as George Ellerby in The Departed

Score: +3