I'm glad someone finally brought this up. Lost in these discussions is that the same things apply to women (at least half of them are mediocre or below, just like the guys). This discussion, every time it comes up, whether tacitly or explicitly, puts women on a pedestal by default and assumes the very traditional notion of women being the one who sets expectations that men must meet, when in reality it cuts both ways. You reach a certain age, as most of us here have, where you've either been through a divorce or seen many friends and acquaintances go through one. Can anyone honestly say that in every situation it's predominantly the man's lack of effort/attractiveness/etc. that leads to the split? In my experience, at least, it's about right down the middle in terms of which partner was the piece of shit. That's a hetero couple only observation. All of my gay friends who settled down have stayed happily married, so whatever secret they've figured out, they need to share it with the straights.
Being toxic, or even just boring, is not a gender specific state of being. Many aspects of traditional male/female gender roles are in the process of flipping or altering in some way, and mid-tier women will have to recalibrate their expectations just like mid tier men have done for most of modern history.