I cancelled my sub several months ago and haven't regretted it one bit.
Netflix has made the decision to go full-bore on original content and completely neglect their back catalog, and that's fine. But the harsh fact is that they will never be able to produce enough original content to make it worthwhile keep subbing for that alone. Even HBO, whose original content is much better and more consistent, still has to offer a good catalog of movies and other content to justify a monthly subscription. And Netflix's once-amazing back catalog used to be what set it apart from HBO, Hulu, and Amazon. But it has shrunk drastically in the last year or two to the point where it's getting harder and harder to find decent content.
Anyway, at a certain point earlier this year, I realized that:
1) Amazon's back catalog now rivals Netflix's. And Amazon's service essentially comes for "free" with my Prime membership (that I already keep just for the free shipping).
2) Netflix's original content, while good, isn't worth the subscription cost just by itself.
3) For about the same cost, I could dump Netflix and pick up ad-free Hulu, which gives me access to a ton of old TV shows that were once on Netflix but aren't anymore.
The choice was then clear. Sorry Netflix, Stranger Things is a great series. But it ain't $10-a-month good.