I was very reluctant about reading this because I just can't read Ginny as a main character in anything, but it ended up turning out to be really good.
Even though Severus says very few words and the focus is slightly more on Ginny, his presence still makes himself known as a strong character, fighting to keep things together and pushing forward.
Ginny is still stuck in her own little world obsessing over Harry in an infatuated fashion, where as Severus truly cares for Harry and the sacrifices he will have to make.
That is what I think love it all about, being able care and hurt so deeply, but knowing you will have to endure them facing terrible obstacles even if its to their own death.