The main difference between Qatar and Dubai is that Qatar has oil and gas to pay for it's lavish spending.
That doesn't solve the problem of quality labour though, this is evident in the quality of buildings and the numerous cockups that have happened at some of the larger projects.
If people were not just here for the money, and instead made to feel part of Qatar, then I expect we would see a decrease in mistakes made, and a better quality of work produced. It's a question of getting people to take pride in their work.