Venezuela's economic situation is more of a product of having oil than it is a product of the so-called socialism of the previous government.
Free money from extractive industries has normally served to let whatever government keep power through handouts to the populace.
Saudi Arabia, as another example, may not be an economic disaster but the regime broadly is a disaster for the foreign workers it abusively employs and the nearby areas it exports its reactionary ideology to.
They're not failed states, they're disasters for the world as whole.
- Turkey (it could use another one about now, if the military wasn't neutered)
- Thailand (providing stability currently)
- Egypt (removed Muslim Brotherhood)