I've been hesitant posting on this because I know nothing. However I feel if rape becomes the main descriptor of a character that's generally bad writing, doesn't always have to be, but if the writer cannot find something else to do with the character, cannot find something else for the character to do other than be related to rape, then I think (baring certain points of story and story length) the writing is not that good then.
There are some stories I'd like to bring up where characters have been raped and I think it was handled well or did not define the character, they where able to move on, but it still affected them in some way.
Veronica Mars - slipped drugs and raped in the opening episode, and it's something the character dealt with, and something that molded her, but I don't think it ever defined her. I think she's been first and foremost a junior-amateur detective.
An oddball - The Raith family in the Dresden Files. A family of succubi and incubi, where the head of the household is determined by rape. And the victor is not demonized by it.
as previously mentioned Jack from Mass Effect 2.
Dexter's Rita - abused, raped, by her husband, clearly defines a large part of her for a while in the first season, but come the second(was it the second?) it's something she has overcame through the course of the show.
I think rape in story telling does a disservice when the victim from then on is only ever a victim of rape. Or, when rape is used more as a blank descriptor, something that I think Mass Effect's Jack avoids for simply having rape be one of the many things she's been through, abused, beaten, raped, thrown away like garbage, experimented on, she went through a lot, and rape is one of those things. For other characters in a similar situation it is their one thing, and I think at times that does a disservice. When rape becomes a throw away, I think it's a disservice. Character X was raped years ago as a throw away line, not to be brought up again, not to show anything about the character, just something to attempt to add something. Yet again where Jack is concerned where rape is a basic throw away for her, so is the abuse, the neglect, and a small assortment of other problems.