Most importantly I feel you are being reckless with the numbers. A statement such as that the NKVD shot "hundreds of thousands" in the lands the Soviets "reoccupied" is a very bold one (dare I say bombastic even) and would require some sort of sourcing/reference.

Additionally you are skirting over the fact numerous Soviet "auxiliary volunteers" were something less than volunteers in the full meaning of the word. They were often captured Soviet POWs who traded horrific conditions in the Whermacht's POW camps or often lethal forced labour in Germany for what for many must have seemed like a better chance to preserve their life — in German service. For others, Soviet civilians who entered the German service from the occupied territories, it was often the only way to gain access to medical treatment, food rations that one could actually survive on, or a way to ingratiate themselves with the occupational authorities and try to win the release of an imprisoned relative.

Reasons for collaboration were many, and just as often they dealt with reasons of bare personal survival in truly brutal and chaotic conditions of total and merciless war, rather than with any grand or romantic notions of ideology or voting against either Stalin or Hitler. We shouldn't be quite so eager to see ideological motives in every action an individual is forced to take (or else we are committing the same error Stalin did in persecuting collaborators across the board even when for many their German service did not actually signify a lack of readiness to accept Soviet power.)

Having spent years personnally reviviewing and analysing Rhein-Metal Borstig range tests on the German's own anti-tank weapons, their allies anti-tank weapons and the anti-tank weapons of their enemies, I can state that they were not oblivious to the failings of Romanian, Italian or some of the Hungarian anti-tank weaponry.

The majority of anti-tank guns used by the Romanians facing the Soviet attack during operation Uranus was the Austrian 47mm. L.39. Bohler anti-tank gun. With a maximum penetration of 69mm. at 100 metres versus vertical homogenous armour plate with APC solid shot, you can immagine its lack of effect on hordes of T-34 and KV-1 tanks.

The Romanian's 75mm. L.48. Resita anti-tank guns (a licenced copy of the German PaK.39.) were not an abundant commodity in the Romanian Army. It was also lacked the German Pzgr.40. APCR ammunition that allowed German anti-tank guns to punch well above their weight.

The Italians also used the same 47mm.L.39. gun licence built in Italy and using Italian APC ammunition. Again the performance was paltry though the Italians did issue HEAT ammunition (Effetto Pronto) for the weapon although this was not much of an improvement.

Out of all the German Allies, Hungary was the strongest, with 20% of the country's ammunition production going to Germany.

Hungary designed and produced its own tanks and anti-tank guns which were of comparable quality, or in the case of Zyrini assault guns, better than the German's own in 1941 – 1942.

Numerous model companies now supply all the troops and equipment of the Axis allies primarily for historical wargaming. I myself have 1:72 scale models of Hungarian tanks and assault guns.

HaT supply plastic 1:72 scale Romanian, Polish, Italian, etc. troops.

History mayhave forgotten about HItler's allies but the world of historical wargaming has not.