The most talented actor in the world cannot turn a shitty role into something respectful, especially in television. A ridiculous minstrel character played by Peter Dinklage would still be a ridiculius minstrel character, which is the whole reason Peter Dinklage habitually refuses those kinds of roles. It's not because he's a bad actor, it's because the things that make a role demeaning are decided by people OTHER than the actor, people who have control over the final product and how it is edited as well.It's not like she brought her own talent into the material she was given to work with, right?
As it stands, Jeri Ryan was given far better material to work with than Jennifer Lien, and arguably better than half the main cast of the show. if Braga wanted to, he could have told her to talk with a high pitched voice and play her character like something out of Jersey Shore, and she would have to choose to either do what she's told, quit her job, or try to convince him to back off on that shit. She chose option 3. Which was an option that apparently Beltran and Wang didn't have (although Mulgrew did, because she's Kate Fucking Mulgrew)