I bought the first edition of the Dark Sun box set and I loved it for the politics and high-level power games. Politics has always seemed to be the core of any Dark Sun campaign to me. Assasinating nobles, rasing armies, working in the underground psionic or arcane movements, driving convoys, fighting tribal wars, trying to alter the environment, making politics and spying in the courts of the sorcerer kings.
It was high-power, high-politics, high-fantasy with a high lethality.
As to being overpowered in comparison to other settings. Well, it's true that the Athasian races were much more powerful than other campaign setting races, but then the Athasian races had seldom any weapons or armor that were any good, magic using was prohibited and generally characters started out with several powerful enemies - and would only gain those as they played. Seldom were there any allies or safe havens.