Thank you, Arya!
For *weakness* I mean: the author opens up deep themes: the psychotic and anorectic woman, her sister's husband's obsession with the spot on her back, their body painting, love making etc: all very strong and deep themes and worlds, which, in reality, the author is not able to *cope with*, so to say. We do not, on any conscious or subconscious level, "understand* something, in the end, I mean: we are not guided by the author to any kind of deeper understanding or *following* into these deep and dark worlds. Or better: we are invited to follow, and we follow, as the writing is intriguing. But then we are left alone with all this.
I did not at all feel enriched by this book, for the contrary: I think as a writer you have responsibility, and you are obliged to live up to the dimensions, to the themes and worlds you create. If you are not able to live up to them, to cope with them - better let be.
So yes, I agree: The actual *writing* is good, intriguing, even *feeling real*, as you say. But the story, the themes and the solutions (or non-solutions) are so weak that I consider it a failure. I know this is hard to say, but as a writer, you MUST do better. If you are not able to, no problem, but: do not touch those themes.