As most topics, it really depends what's done with it.
The idea that some topics can't be depicted in fiction is compleyely inacceptable to me. They are many, many reasons to depict a difficult topic, and plenty of them are legitimate, some salutary.
In the case of rape, it's unfortunately a common crime, and it entirely makes sense that the topic would show up often in fiction.
However, I do have s strong dislike for stories using rape 'lightly', by that I mean, without any or much consequences. The worst is when the author is clearly portraying a rape but make it pass as totally normal, that's a total dealbreaker for me (to be honest, not only for the story, I'll avoid all the author's works); but I also strongly dislike when the author does indicate it is very deleterious, but then there are not many consequences in the rest of the story, if any. This is more of an issue because it's relatively common, especially when the agression does not go as far as rape. For eg. I often see that 'sexual agression/rescue before rape' trope. With no consequences!??! Obviously I understand the relief on the spot, but I do expect at least some consequences later, but no, in a lot of stories we jump to an other thing and it's forgotten. It always make me feel uneasy.
But when someone want to actually tackle the subject seriously, I don't have a problem with it at all. It should not be considered as a bad subject or as a taboo. That would be detrimental.