Malin Akerman is a great comedic actress, who can also play off the all-American girl look. She's got blonde hair, but she has been brunette at times, so her look can go either way depending on the type of Wonder Woman the studio would want. At one point the studio was considering a blonde Wonder Woman, so it's not completely out of the question. How do you feel? Should Wonder Woman always be brunette, or do blondes have more fun?
She has already played a role as a superhero in the movie 'Watchmen,' which is based off a comic book that is essentially a deconstruction of the hero genre. She played the role of Silk Specter, so can she play a superhero? Absolutely. Did she play Wonder Woman? No, she did not. Although, that second part is obvious.