Take a minute to learn the factors that affect your attacks. As the Soviet leader, you can initially bludgeon the Germans, but you'll soon find that you don't have an unlimited supply of men and material. It's better to employ your forces effectively. Try to utilize the corps integrity rules, air support, close artillery support, and long-range artillery. It will make your gaming life much easier.
Partisans are so cool.
Both endeavors make them worth their weight in vodka. Don't make foolhardy attacks. Use the powerful Soviet infantry to rip holes in the German lines, and then follow through with the tank formations. Surround formations, cut off their supply, and then destroy them.