Wehrmact lost most of its power fighting in Russia especially at Leningrad and Stalingrad .. Hitlers decision of dividing its forces for multiple attack points on very wide lands and resuming a war at Russian winter was a fatal mistake..
On the other side the air war at Englands skies was costly that Luftwaffe had to stop it.. and used that v bombs instead..
US forces even hardly beat the remains of Wehrmacht
The Americans took quite a beating by Rommel's desert army in Tunisia. During the liberation of France the Germans had the better army and generally better equipment. The Sherman tank was known as the Ronson as it would light first time every time! But what sums up the situation was when a German officer asked what had happened as an 88mm anti-tank gun crew retreated, one replied, we ran out of shells before they ran out of tanks! Nobody could match the quantity of US equipment and production capacity.
agreed with one exception
however, I must note that although number of equipment/ships/planes plays an important role , more than that it, depends how and where you use them.. One good example is that Russians were always crowded on total numbers but German attacks on strategic points with arms having better technical properties and management always gives better results unless Hitler tried crazy suicides for his army
Yep, Hitler was one of the best weapons for beating Germany that the allies had. As a Corporal playing at being a Field Marshall he was a disaster, his no retreat policy meant the annihilation of several German armies. When he called upon his drug addict friend Goering for assistance he always fell short from Dunkirk, the Battle of Britain, through to ferrying supplies to the army cut off at Stalingrad.
The Russian approach was brute force which showed in their casualty figures. When Russian armies attacked, retreating Russian soldiers were generally shot, so it was better to continue attacking until you were killed.

Russian equipment improved with the best all round tank in terms of materials and performance with its sloping armour being the T34, but the best tank was the Tiger and Super Tiger., which outgunned all other tanks, but it was an expensive complex design to manufacture, so was never available in sufficient quantities. Allied tanks were always a generation behind where they need to be, with the war over before our next generation which would have competed on equal terms making it to the battlefield.