Guybrush
I would hazard a guess that 95% of those who complain still love flying.
The problem is that we came into a profession (note;profession) with certain expectations based on observation.
We expected the basics to remain the same or even improve gradually over time.
The thing is, having made a significant investment in money, time, and effort, we have found that recently things have gone to hell in a basket.
That is valid cause for complaint no matter how dedicated you are.
I call it a profession because it requires very specialist training, and it takes about ( and often more than) 7 years to become adequately trained and experienced to command anything other than small aircraft.