1. Russian military performs worse than was expected by western experts but still has enough explosives to flatten out large swaths of land - as we see they don't care at all about collateral damage or outright target civilians as an easy prey.
2. NATO military was not really tested in full scale combat and can perform worse than expected too.
This is not really a poorly performing military. This is a terribly incompetent plan proudly made by only 5 people.
NATO has had plenty of logistical failures but it doesn't narrow it's planning to total top-down so those failures are dealt with and worked around by elements in the middle and on the field.
2. NATO military was not really tested in full scale combat and can perform worse than expected too.