I was just flipping through a few channels and I noticed quite a few non U.S. actors affecting American accents.

I was wondering... How do you guys (in all countries) feel about non-US actors adopting US accents?

Do you think they are any good?

Fair enough if they do a good job. But then again, why should they have to 'mimic' a US accent?

We've had lots of movies where mixed input/ accents work really well - a good international movie.

Some actors I can think of using US accents...
(just a few)

Anthony Hopkins
Russel Crowe
Sam Neil
Catherine Z Jones
Mel Gibson

Heck, when I started typing, I remembered quite a few more.