From what I have heard they did NOT leave because of the working conditions at Qatar but they experienced some serieous problems on a personnal level.
If you arrive in Doha with the expectancy to see an efficient company like we are used in europe you will be very dissappointed!
Doha and Qatar are catching up very fast but they still have a long way to go so everything tens to run here a little bit harshly!
You need a bit more patience and most of all you have to have a thorough inside view of how to do business in Qatar...
In fact the only group within QR that really has a reason to complain is the cabin crew!
QR is demanding an awfull lot of them, the pay is not very good and the fear amongst some of the cabine attendants is huge....
That is one thing that QR managment really needs to change!
Considering all the flight crew in general some conditions will have to be addapted since they need a lot of pilots and CAs and the pool created after 11/9 is almost dried up.
The package will have to get on the same level as EK I think...