Ah, the No True Crossfit Gym argument.
Everyone always seems to come from the one good Crossfit gym where correct form is emphasised. Where the coaches are wonderful. And so on.
The point is: trainees very rarely have the knowledge, qualification or experience to know if they are being taught properly.
It's like martial arts schools, everyone's Sensei or Sifu is an international badass.
The central problem is that CFHQ don't do quality control. Ostensibly because of a libertarian outlook, but I can't help but notice that it allows them to 1. milk the fad while it's booming and 2. better insulate themselves from lawsuits.