Have a look at some of Hollywood’s international artists and how they’ve been ‘rated’ in terms of their accent abilities.
Bare in mind this is all one man’s opinion but some of it is fascinating. If you haven’t seen all the shows see if you can find some clips somewhere to check out how you rate their American accent or what you pick up yourself in their performance of it.
http://www.boston.com/ae/tv/blog/2008/11/_television_is.html
