From: Bedfordshire UK
Who will know how things would have worked out with a different plan for Barbarossa, however it is clear that the July 1941 plan failed because there was no agreement between Hitler and the German Generals over what should happen after the first battles on the frontier. Hitler, as stated in his original Directive, wanted to capture Leningrad and the Ukraine, then move on Moscow. The Generals wanted to go straight to Moscow. This conflict caused a delay in August at Smolensk and when Hitler got his way the Panzer Groups were sent off in different directions, as objectives were changed. By the end of the 1941 campaign, the Germans had failed to win any of the main targets (Leningrad, Moscow, or Stalingrad). The success of Blitzkrieg requires the concentration of force ( Guderian always said this ), Hitler's interventions resulted in force being spread all over the USSR.
I favour the early planning by General Marks (Plan Otto), which has a more equal division of Panzer forces between Centre and South, each gets 2 Panzer Armies. This makes Army Group South strong enough to cature Kiev, without diverting forces from the Centre. Each attack can use its 2 Panzer Armies to achieve encirclements (Historically Army Group South with only 1 PZ Army was operating one handed and Guderian's PZ Army was directed 200 miles away from Moscow to help). Using Plan Otto, Centre and South can converge after passing the marshes and concentrate an attack on Moscow. Each can protect the other's flank and concentrate together in a massive attack, as Blitzkrieg was intended. With Moscow captured, Leningrad will probably fall. The rest comes later. By concentrating on more limited objectives you can at least ensure that you win something. Historically the Germans sat outside the Moscow and Leningrad, in the snow, while the Russians fed fresh troops through Moscow with good rail connections. How different would it have been if the Germans in Moscow had been able to push forces out on the radiating rail lines, while the Russians struggled around front in the snow.
I have tried these options and Plan Otto works in WIR, admittedly against the AI. It has been commented before that the AI is limited, which it is, but then so where Russians in 1941. The main problem the Germans face is distance, time and supply, which WIR does very well.