From brilliant to rubbish: British accents delivered by American actors

Casting an actor to portray a different nationality is always tricky. The feat becomes even more complicated when the actors are tasked with portraying prominent historical characters in their respective culture. A great example is 'The Other Boleyn Girl,' which received harsh criticism for casting two American women to play the Boleyn sisters, Anne (Natalie Portman) and Mary (Scarlett Johansson). Here are some Americans who have played British characters, as well as what critics have to say about their British accents.

Do you agree with the critics?