No mate - you can't turn around and say that just because the British had concentrated their forces and the Germans where exhausted etc that the British were no good at this whole fighting thing - lets look at the fighting during the Spring Offensive before the American Started arriving shall we?
Sure, let's. The German success was predicated on the British vulnerability thorough a serious of incredibly stupid decisions that let the Germans breakthrough and then beat themselves through a lack of strategic plan.
The German army had the advantage then - superior numbers (the Reinforcements from the Russian Front), superior experience - they used their best soldiers in the Storm trooper units - the best units they had, and they attacked the British 5th Army which had just taken over that portion of the Front line from the French only to find it had no prepared defences in depth which the British used everywhere else on the front line. So effectively the weakest spot in the British front line.
Germany did not have superiority of numbers compared to the British, French, Belgians, Italians, and Americans in France on the front line in 1918, the Germans were able to mass at a specific point where the British were weak and broke through. There also were no Stormtrooper units; they were 4 classes of divisions, the best being attack divisions which formed temporary assault formations to break through the trenches and were then dissolved and returned to their normal units in the division.
All that advantage yet they failed to break through the British Army - pushed them back certainly - but at great cost and it gained them some crap real estate.
They broke though, more than anyone had since 1914, but the Germans ran out of steam and wasted huge resources trying to extend that breakthrough on the northern flank instead of reinforcing success; the Germans beat themselves basically, much more so than the British or French beat them.
Then when we get to the 2nd Marne and 100 days where the Entente beat the German army.
After several other offensives that culiminated in the 2nd Marne. The Germans were exhausted and beaten by the cumulative casualties they took in the process of their multiple offensives and US manpower arrived at the 2nd Marne to turn the tide overall and allow the British and French to concentrate enough manpower to go on the offensive, as the US troops, many of whom were not yet ready to fight, took over a large quiet sections of the trench lines to allow the rest of their allies to attack in August.
And yes like all other battles in the war casualties sustained during the 100 days were similar on both sides - only this time the battle was decisive and the Material and artillery losses of the German Army was crippling and while I suppose we have to congratulate the German leadership for realising that they had lost and throwing in the towel - this does not mean that the German army was not beaten in the field - it was.
It was beaten before the 100 days started, the 100 days just pushed over the tottering German military.