You’re trading one form of corruption for another. Once Castro was given enough time in power, he proved to be no better than Batista. In 1959, he falsely promised free and fair elections in 18 months, and then ruled for five decades.
I think Che’s idealism may have been better suited for the role, but that wasn’t the plan. With Cuba’s small scale and valuable exports, they should be able to successfully run a socialist or communist nation without intervention.