Operation Barbarossa was technically, tactically and strategically perfect.
The problem afterward was twofold.
Firstly, Hitler wanted Ukraine and Lebensraum, splitting the forces which should have went straight to Moscow.
The secondary problem was the immediate implementation of the SS in those countries Germany took over. At the beginning, those countries looked at German troops as saviors from the USSR and would have gladly supported the Germans and fought against Stalin. The SS soured this massively and put a huge partisan movement over their supply lines.
Yep. The Germans were the victims of their own propaganda. They built a culture of extreme xenophobic arrogance and created resistance movements everywhere they went.