Well, Brand's only had, what, 10 or 12 issues' worth of appearances, and mostly as a side character with a few pages at most in those? That's not a whole lot to establish a character's personality. I imagine part of the point of this series is to flesh her out, given that people inside Marvel seem to have taken a liking to her. A female Nick Fury set on a cosmic/alien backdrop does have potential, even if it doesn't amount to a characterization.
And, for the record, Maria Hill strikes me as more of a female Gyrich. She's very anal and by-the-book until she grows attached to Stark and starts breaking rules for him. Fury and Brand are more from the maverick, Han Solo mold. They're ultra-competent (except for Fury not figuring out that he was working for HYDRA for 40 years, which I will always bring up when I mention him because it's so stupid) but they clothe it in a veneer of nonchalance and are very independent. Their way or the highway, basically.
Plus, in Brand's case, her being a bit of a freak with Beast is part of her character. The same way Tony Stark being a colossal man-****e is part of his character, Brand being unafraid to wear her sexuality on her sleeve, in contrast to a lot of her high-level female authority-type peers (*cough*Hill, Hand, Val Cooper, etc.*cough*) sets her apart and becomes a distinctive part of what makes her her.