It's worse than you think.
Many of the "failures" you read about here, and in other forums as well, are the result of user ignorance.
This ignorance includes failure to read the instructions, failure to learn proper technique, failure to practice any technique at all, and a need to blame the machine for the machine user's own failures.
There are exceptions to this "rule," of course. Taurus guns do suffer from poor quality control, as did the oldest Charter Arms revolvers. I'm certain that there are others.
But in most cases, the "machine failure" complaints voiced here are mostly really machine-user failures.