If by infrastructure you mean roads, communication net, gaz an electricity nets, and so, it is so and so, rather good with signs of weaknesses, especially the drinkable water distribution net.
If you add schools, hospitals, police stations and public service, it was very good 20 years ago, and has been steadily losing in quality. And that’s one of the reasons of the progresses of ultra-right.
If by sustainability, you mean from an ecological point of view, i would say that globally, France is late but some efforts are made.
For instance, the Sustainable Development and Planning Project (PADD) is an essential element of the Local Urban Planning Plan (PLU or PLUi). It means that when a town establishes it Local Urban Planning Plan, it must establish a plan of sustainable development.
A law on zero artificialisation is effective. It means a ban on encroaching on agricultural or natural areas for new construction.
There is a big limit : The present French government is the defender of real estate developers and it wrongly blames planning laws and jurisdictional controls for the insufficient number of new constructions instead of calling into question real estate speculation, and its policy of restricting credits for the construction of low-rent housing
I am not sure i have answered your question. my answer is at best sketchy and except about some points more founded on feelings than on data.
What is true is that for the foreign investors, the state of the French infrastructures is very attractive.
[France - OECD Infrastructure Toolkit]