Don't take this badly but it sounds like you've only seen a tiny slice of the software development done out there and had some really bad experiences with Agile in it.

It's perfectly understandable: there are probably more bad uses of Agile out there than good ones and certain areas of software development tend to be dominated by environments which are big bloody "amateur hour every hour of the day, every day of the year" messes, Agile or no Agile.

That does however not mean that your experience stands for the entirety of what's out there trumphing even the experience of other people who also work in QA in environments where Agile is used.