What actor/actress was completely 100% wrong for the role?

Winona Ryder was kinda bad in that too. And although I didn't see it, I suspect she was a misfit for Little Women too. I bet brits were raging at that one.

sorry I think I meant Age of Innocence

Yeah, Costner is actually a good Robin Hood. He captured the spirit of the character. He just needed to to that generic “historical accent” you know, like Joaquin Phoenix in Gladiator or the soldiers in 300. He couldn’t do a British accent.

I remember there was outrage when Zoe Saldana was cast as Nina Simone in the biopic Nina. Uzo Aduba would have been the better choice given her complexion was more closer to Simone's than Saldana.

Vince Vaughn as Norman Bates in the Psycho remake was just wrong. Viggo Mortensen would have been better rather than being cast as Sam Loomis, but in complete honesty, the remake should have been made.

John Wayne as Genghis Khan in The Conqueror was a terrible choice. Sessue Hayakawa would have been better.

It's hard to take Denise Richards as seriously as a nuclear physicist in The World is Not Enough. I don't know who have been better around that time, but the role needed an actress with more gravitas.

Denise Richards was not bad in the role and I feel she did have gravitas. I think it's you who needs to unplug yourself from what you think a nuclear physicist looks like and sounds like in that head of yours.

Denise Richards fulfilled her job as a Bond girl that's all that matters. or don't you know what a Bond girl is?