When looking at the different German levels of war, what mostly doomed Germany is its ideology-inspired, apocalyptic, and unrealistic strategy. Germany in the Second World War provides an illustration of why the strategic level is essential.
The German offensives of March-July 1918 demonstrated the German ability to achieve great tactical success. However, the offensives were an utter operational and strategic failure. One of the main reasons is the inability of Ludendorff to follow the stated operational aims.