The british historian Alan Clark (Purnells History of the Second World War) reckons that most judges now agree that Hitlers no retreat order in the Winter of 41/42 saved the day for the German Army. In retrospect Kluge's Chief of Staff wrote;
"Hitlers fanatical order that the troops must hold regardless. in every position and in the most impossible circumstances was undoubtedly correct. Hitler realised instinctively that any retreat across the snow and ice must, within a few days lead to the dissolution of the front and that if this happened the Wehrmacht wouls suffer the same fate that had befallen the 'Grande Armee'."
General von Tippelskirch went even further , rating it "Hitlers one great achievement".
Thr trouble was Hilter carried that policy on right on to the end of the war in circumstances when it was disastrous.
There were a lot of self serving biog's published by German Generals after the war that blamed Hitlers interference for every mistake, including their own. Manstein and Guderian in particular.