So you have not joined yet?
In that case prepare to join the 320 as there are very few places left on 330 and 777.
QTR is not a bad place at all and if you can get used to the "rural" middle east lifestyle Doha has to offer you might find the place rather likeable.
The routes we fly are nice ( bit less on 320 but still it does have some nice routes), the money is always in the bank and if you do your job as per company rules and regs nobody will ever bother you!
The injustices between different fleets and the incompetence of the flight ops management (generalised, some good individuals present) as well as the Arabic/indian approach towards HR are things you will have to learn to live with!
Good luck..