True, while outdated, the term yaoi is "Yama nashi, ochi nashi, imi nashi' which basically says "no climax, no point, no meaning" (as far as storytelling goes).
Some will be better than others but essentially they are all "here & now" without any thought to plot.
I actually would disagree with that generalisation. Similar to other genres, yaoi too, has many stories with complex plot. But I do agree if you meant that there are also lots of stories just for the sex scenes. However, as said before, a strong or weak plot is found in all types of genres. This story here would be just one of the weaker-plot-examples for yaoi between many good-plot-stories
Well... the art is good at least. But the stories.. hmm. I can just speak for myself here but I didn't like the random start and I also don't enjoy the "rape leads to love" stories. There was no character development at all and the relationships were too superficial. All in all it was just sex without plot