Flown Qatar a couple of times in business and first. The young have flown in economy. Economy was reported as not being up to much. In both first and business it was all show and not much else. A five star airlne is not created by handing out sweet little track suits in first class. The cabin crews were either terrified of everything if they were Malaysian or little dictators if they were Arabs. It didn't help much being of the same persuasion as them either. The personnel at Doha were really and seriously quite ghastly, although the first class lounge was excellent. It was the women in particular who were vile. Got to say though that some of their prices are hard to beat and will be using them again soon albeit with a grimace. Please make sure you familiarise yourself with the emergency evacuation drills with this operator. The general impression given by so many of the staff is that disembarkation from Qatar Airways is so uppermost in many minds that passengers might get lost in the rush.
Qatar airways is by no means a five star airline, not even in first class to and from London. Mr Akbar Al-Bakr, the CEO, has a terrible reputation with his cabin crew in particular. That is a matter between those parties but you will never, ever have a five star airline if your crews are unhappy!
(edited to read: really and seriously unhappy)