I don't have any problems with Jolie playing the role. This really isn't anything new. Here are some examples:
In Spike Lee's movie "Summer of Sam", John Leguizamo, who is Colombian, played the role of an Italian
Jamie-Lynn Sigler of the Sopranos plays the role of an Italiana when she's actually of Cuban-American heritage
A black American played the role of a Dominican in the Shaft movie
Dominican Alfonso Ribeiro played the role of a black American on the Fresh Prince of Bel Air
There have also been countless biracial roles in movies that were played by light-skinned blacks who were not biracial
The biracial Halle Berry has played the role of black women in her movies.
Oh, and how could I forget all the whites (from Charlton Heston on down) who have played the roles of Native Americans in the Westerns.
I just see it as acting and what really matters is her performance. Besides, Jolie looks as if she could be biracial herself. Gratuitous Angelina Jolie pic:
Peace.