I agree that kleptocracy and incompetence are a important factor, but I'm not sure it's the only one. There's a correlation between corruption indices and low GDP but I'm not sure it's causal. For example the US scores only moderately in corruption index terms, but does quite well in GDP terms. Arguably GDP growth rates are a better measure, in which case there's possibly a inverse correlation.

For example China, India and Malaysia have grown quite substantially are not particularly transparent, but they are alike in their resistance to dollarization. On the other hand Ecuador and El Salvador are examples of countries that have fully embraced dollarization with less than great outcomes. There are examples in the middle as well, but there is not a clear trend that it's necessarily a change for the better of the country and it's citizens.

To me it seems like a continuation of the IMF's dollarization as described by Joseph Stiglitz in 'Globalization and its discontents', in terms of mechanisms and effects on recipient countries. From this perspective it's less like transferring power from kleptocrats to the people, and more like choosing kleptocrats that are offering a better deal.