9. Kevin Costner - Robin Hood: Prince Of Thieves
Robin Hood: Prince of Thieves may have turned a hefty profit at the box office and given the world Bryan Adams' iconic tune "(Everything I Do) I Do It for You," but as a Robin Hood movie, this thing is immediately sunk by the flagrant laziness of lead actor Kevin Costner.
As was a major talking point at the time of the film's release, Costner bafflingly opted to play the Englishman protagonist with an ambiguously not-English accent, ensuring every word that came out of his mouth was difficult to take seriously.
Apparently Costner and director Kevin Reynolds argued over whether or not he should attempt an English accent, and seemingly decided that he shouldn't bother.
But beyond that, it's impossible to watch this film without simply seeing Kevin Costner, the actor, trying and failing to pass as Robin Hood. And this was all the more true if you watched it upon release, just a year removed from the Oscar-winning success of Costner's Dances with Wolves.
Costner was so, so wrong for this part in every fiber of his being, and had one of the thousands of more appropriate actors replaced him, the film would've surely been received far more favourably.