Does being rendered vulnerable devalue someone as a person? Needing help doesn't make someone weak, and doing everything alone doesn't make one strong. She never gives up or bemoans her situation; instead she does what she can to escape all while telling her would be rapist to go fuck himself. And her efforts do bear fruit. She was instrumental in her own rescue. More importantly though, her situation never breaks her. Asuna proves this by being able to move on, and when placed in a situation to do so she takes command again in Mother's Rosario.
Asuna never became weak, she just got fucked over, because sometimes, shit happens.
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You're in the vast majority with the opinion. I like it, as do a few others, but the "SAO is the best/worst anime ever" flame war has already been done a few times on this site, so... yeah.