These models have become an engine for the analysis of fiscal policy and taxation. In my view, these kinds of frameworks are robust in terms of describing some stylized facts for free-market environments with very simplified hypothesis. However, they are not able to address some empirical regularities, which are more usual in emerging countries.
The vast amount of unemployed resources, including the capacity of the public sector to take the first step in solving this inefficiency is just one example. On the other hand, endogenous growth models acknowledge that fiscal policy is one of the key factors in explaining the different growth rates among countries.