I don't think the worst aspect of SAO is that it's badly written but more that it's brutally dishonest and lacks self-awareness in how it presents its self.
It tries to have strong female characters but doesn't have clue what "strong" means. Basically every story has come down to a "strong" female character needing rescue by Kirito the generically handsome strong guy.
To clarify, they aren't weak because they need help, they're weak because they always need help and the opportunities they're given to return the favor are token moments at the most, and almost invariably involve getting rid of lowly mooks. Seriously, why can't Sinon keep it together when facing her trauma but Kirito can when he faces the same dilemma? It really hits home the fact that no matter the circumstance, Kirito will outperform every other character where it actually counts. If it were up to Kirito to use a rifle with a busted scope to save Sinon from Death Gun, he would without a doubt land the shot just in the nick of time, whereas Sinon was incapable of assisting Kirito because of her busted scope.
It always comes down to that because that's the scenario the author always depicts in the end. Kirito ultimately saves the day and another waifu is added to the collection. Not a single female character in this story has actually been able to solve their own problems, resolve any major plots, or at the very least save their own skins in dire scenarios. It doesn't help that they're barely characters at all on top of being incompetent physically and mentally.
Also don't forget how the "strong women" in SAO are only really "strong" before they meet Kirito. Asuna goes from someone we're constantly told is one of the strongest players in the game, responsible for making considerable progress in saving everyone's lives, to Kirito's domesticated housewife whose only ambition in life is "to be with [Kirito]." Her only bit of action in the 2nd half of the first season was an attempted escape that culminated in her being sexually abused, and she became a sexual abuse target AGAIN just a few episodes later. In GGO, she's literally nothing but a cheerleader who holds her husbando's hand despite being ostensibly just as capable as Kirito of investigating Desu Gun.
Sinon was shown to be strong and capable and awesome before she met Kirito, but from the moment Kirito enters the picture she's constantly losing her cool around him, always flustered, and needs him to come to the rescue. Sure, that's because the "plot" necessitated his rescuing her, but it's a pattern SAO consistently repeats. You build up these extremely capable women and have them slowly, over the course of a few weeks, become completely dependent on Kirito for survival and emotional support.
It's a male-centric power fantasy story, so it's not exactly surprising. But that's how the series works.
And it's just revolting that the only way SAO seems to know to make us hate its villains is to have them try to rape someone, because according to the author the only stake girls can have in a narrative are either A) something/someone assaulting their naughty bits or B) death.