Death Korps have a massive morale advantage as they are brave to the point. So normal Stormtroopers, not Vaders Fist/501st, versus the Death Korps of Krieg. Hell, Krieg means WAR in German (as you have gathered, the Imperium does not do 'subtle'). In fact, they will take any objective and vanquish any enemy, just as long they have enough men to throw in the meat grinder. They like trenches and gas masks and are known for their iron discipline and suicidal tolerance for casualties. Though a Commissar isn't even necessary for the Kriegers for morale.' Animals flee this hell the hardest stones cannot bear it for long only men endure.' – Diary of an unknown German soldier at StalingradThe Death Korps of Krieg, the most Grimdark of GrimdarkThe Death Korps of Krieg is a series of regiments which hail from the of. Even their are more badass than your average Commissar.
