The largest country of Central Asia is Kasakhstan. But that doesn't mean that it is densely populated. The opposite is the case. The former Soviet Republic is rich of oil-resources but otherwise the nature is very poor. The harsh and high temperatures make it a not very fruitful soil. But besides the steppe of wild grass the soviet leadership tried to implement monocultures such as wheat or cotton in a very big style. So eventually the people, who formerly lived as nomads and had huge herds of sheep and cattle, became a nation of peasants and filled the largest chamber of wheat in the union.
Uzbekistan is certainly lacking in infrastructure, especially in the field of tourism. Considering it is so rich in historic sites and have such a great potential they surely are years behind.