I worked three and a half years at QR and enjoyed most of the time. Fantastic layovers. Made fantastic friends. Lived in a nice flat in Doha (although Doha was very dull). But yes, it was a very different environment with a their way or the highway policy. No mistakes. Constantly watched by someone. Settling in to a muslim country can also be difficult, let it be if you are from Asia, Europe as me or somewhere else. And yes, many people were unfairly and disgustingly treated (some of my friends included) by the management. When I joined I didn't know what to expect and made the best out of it which worked fine for me.
I didn't know QR employ people who are 19 years old? I would have thought at least 20 according to the law of Qatar?