I'll bet that those failed projects would not have been called a failure in China.
Germany and much of the West as a whole has largely stopped investing in anything but tax cuts and entirely pointless military spending. The neoliberal gamble is that private actors can produce growth if government just gets out the way. At this point, given the last forty years of so-so growth and massive inequality, it's not looking too good.
It's probably for the best since Germany is only going to get older and older [2]. They can use all the savings to build hospital beds etc while economic growth continues in Asia and Africa.
[1] https://www.economist.com/europe/2017/06/17/germanys-low-inv...
[2] https://www.weforum.org/agenda/2018/01/germany-will-hit-a-si...
I don't understand this claim; Germany and many EU countries top the lists of tax-to-GDP and effective tax rates in the world, while its military expenditure (as % of GDP) is lower than China's.