I don't know if you will like it, but I think it's one of those movies that most critics misunderstood. And you're the only one who watches the movies that I do, so....
It threw me at first, because if you view it as a straight thriller then it's not really up to much. There's not a lot of suspense. And the conclusion isn't much of a twist. "Erotic thriller" doesn't quite catch what's in there, either. Those bits are more like a frame for the film, but Campion uses cinematography, unusual casting, characters and relationships to make something else out of the materials. The way Ryan's character seems to walk into danger threw a lot of people, I think. People couldn't work out if it was self-endangerment or subjective strength. I'm throwing my lot in with the latter.
It's one of the best presentations of a woman's interiority I've seen in a film.