They can pop out defects and if things go wrong and there's friendly fire or civilian loss, it's chalked up to scrappy efforts in war. The USA does not get the same amount of leeway, saving our people is a top priority and the media harps on any mistake.

It's an existential threat for Ukraine. The US has not faced a similar (external) existential threat in a very long time.

Ukraine fights back or they lose their sovereignty. Most of the conflicts the US gets into, it's entirely a choice to put soldiers at risk.

So yeah, the evaluation of war effort will be different, because the situations are completely different.