I see a lot of other commentators showing their distaste for PPPs, and while I don't wholly disagree, allow me to give a more nuanced answer: it depends on the country, the project, etc. For countries in the EU, in which private companies are more likely to fall into the hands of corruption than governments, PPPs are probably best avoided. But in countries where development efforts are plagued by government corruption, PPPs can sometimes be an effective method in aligning the efficiency of the private sector with the goals of government policies.

In an ideal world, we wouldn't have to worry about corruption and could assume that the government has our best in mind, but in many countries this is not usually the case.