Now replace "Nationalization" with Monopoly and you see the same problem from the other side.Nationalization can produce adverse effects, such as reducing competition in the marketplace, which in turn reduces incentives to innovation and maintains high prices
That sounds like a failure of the state, not the Nationalized industry.Economics Online suggests that in the past, many operators and managers of publicly owned utilities were not “required to meet any efficiency objectives set by the state”, and that “because these industries were protected from competition, they had become increasingly inefficient”.
To quote
If only there was some way we could look up information and work out how to run something without it failing.it depends on what you do to achieve an end result
But again, you still haven't defined what "become increasingly inefficient" exactly means and why its a bad thing,