Indeed, but Tony Curtis in The Vikings made Kirk Douglas and Ernest Borgnine, in the same film, look like a the product of a Casting Director's genius.
While we're on the Viking theme, Richard Widmark in The Long Ships was a casting nightmare (along with Russ Tamblyn!), although Sidney Poitier as the Moorish King who sentenced the vikings to ride the Mare of Steel was preety cool.
Excellent Viking casting:
Vladimir Kulich as Buliwfy in the The 13th Warrior (and just about all of the Norseman characters)
(But Antonio Banderas as a Moor? Actually not to bad)
Victor McLaglen who could never be miscast in any film that even remotely referenced Ireland was thoroughly miscast in Prince Valient as Boltar.
(Pure genius in Gunga Din, The Quiet Man , and The Informer)
But now let's return to Bernie Schwartz (Tony C) and his long list of mis-casts: (In no particular order)
1) The Vikings
3) The Black Shield of Farnsworth ("Yonder is the castle of my faddur.")
4) Son of Ali Baba
5) The Prince Who Was A Thief
6) Taras Bulba (Which could not have been made more clear than comparing his performance to that of Yul Brynner in the title role)
And each and every costume drama in which he was mis-cast.
Check it out though - He was bedding all of his female stars in these otherwise good movies: The lovely Vivian Leigh and ethereal Christine Kaufmann (Town Without Pity of the Gene Pitney fame - starring Kirk Douglas)
Come to think of it, it's pretty amazing how often Curtis and Douglas paired in one way or the other: One being a hack in anything but romantic comedies and the other being a, at times, quite fine actor.