The impact of strategic bombing on manufacturing is debatable. However, it is true that the Germans were running out of resources towards the end of the war, especially fuel. Oftentimes they had the tanks, but no fuel. They were also running out of men towards the end of the war, but the Russians had something to do with that.
As far as the OP goes, I think it's tough to generalize. At the tactical level, there would be a wide range of abilities, morale, leadership, and proficiency. One person's impressions could be influenced by the particular units that he fought against.