American schooling sucks because it's beholden to political objectives contrary to the interests of educating children. Look at the manufactured controversy over "intelligent design" a few decades back, or the current controversies over transgender bathroom access, or Florida's censorship of material in school libraries[0].
Municipal broadband and the post works well because the US is good at building infrastructure. But at the same time, our government is also beholden to interests that want to kill that infrastructure so they can sell costlier and worse equivalents. States passed a bunch of laws to ban local government from running ISPs and Congress has been putting stupid funding mandates on the USPS's pension schemes that make a profitable public venture unprofitable.
Transit is a bad example because America is famously addicted to cars and allergic to any transit system that isn't a road. The NYC Subway could not be built today under the current political climate. Hell, it wasn't even built by the city or state government; it was stolen from the people who built the system through overregulation. Nationally, we have Amtrak[1], which was created by bailing out failing freight companies. With some high-speed upgrades it could be great, but the system is still beholden to those same freight companies' infrastructure[2].
The underlying problem is that America does not want to build working government programs. It is run by people who deliberately take funding in order to burn it so they can complain about how much better "privately-run" monopolized systems are.
[0] There are probably examples that right-wingers would point out as well - maybe check Reason or CATO for them, because I forgot.
[1] US citizen: Japan has high-speed bullet trains! We should build a Shinkansen!
US: We have a Shinkansen at home.
Shinkansen at home:
[2] Which, BTW, is actually supposed to give Amtrak priority over the rails. Like it says it in the actual law. Nobody cares.