Not sure what they are like now, but I did a stint there in 1998 and they had problems keeping staff due to salaries and conditions. (Thats why I did not stay!)
I did hear that the Eng Manager just left, Tom Botha, who was a good guy, so goodness knows what is going on there now. From what I recall, they did fly you out there for an interview and a look around.
Accomodation was not bad, Doha a very quiet place and a bit of a construction site as they start to redevelop the place. But a good expat community and plenty of stuff going on family wise.
Good luck