>>283239015
SAO has its problems.
For example, the first heroine wins before any of the others show up... but the others fall in love with Kirito anyway. It's like a weird fake harem where there actually isn't a MC bowl. It rubs many the wrong way.
Second, after a while Asuna genuinely feels like a Mary Sue who can do no wrong and is naturally adept at everything. It ends up that way in Progressive as well.
Finally, there's also a lot of Rape-adjacent scenes in SAO which also alienates many.