Based on how ubiquitous it is to hear about agile failure modes, this suggests to me your experience isn't widely applicable.
Counterpoint: Maybe you're just hearing from a "Vocal Minority". And maybe the people quietly doing agile and enjoying it, don't feel the need to go around trumpeting it to the world?
No, the grievances against Agile are just too voluminous and wide-spread, consider even Dave Thomas's presentation about how Agile is dead due to the ease with which it is subverted for political manipulation [0].
If someone as key to software productivity as Dave Thomas is saying this, it's clearly not just because of a vocal minority.
Your suggestion that we should check whether it's just a vocal minority is a good one. We should check that.
Unfortunately, it's extremely obvious that it's not the case, and the dysfunction / failure mode of Agile is extremely common, by far the majority of Agile implementations.
Counterpoint: Maybe you're just hearing from a "Vocal Minority". And maybe the people quietly doing agile and enjoying it, don't feel the need to go around trumpeting it to the world?