I mean, a negative reaction if that this whole overstretched shaggy dog story ends is kinda understandable. That said death threats and threats of violence? FFS fans... There are far more worthwhile targets of hate and spite out there. Ultimately all she did was deliver a disappointing telenovela in manga form
I stopped reading it about a quarter of the way through as well when it became obvious that it was going nowhere fast. Even I didn't expect to stretch to 276 chapters. What I find annoying is that the art is generally great (same case with good ending) and the initial stuff is also but then as it goes on all you get is frustration and disappointment. You keep on going hoping that initial feeling is recaptured but while you get the occasional flash of hope, just enough to string you along, it never quite turns around.
Ending aside does anything happen in the other 200 chapters after chapter 70 or so?