The Austrians suffered from awful financial mismanagement and incredible corruption within the military hierarchy, and so they suffered a number of bitter defeats throughout the centuries. To say they were the worst in Europe at fighting wars is a little far fetched, but it certainly could be said that they were the weakest great power. Regardless, most of their victories were diplomatic and political rather than strictly military, and while they did lose a lot of major battles and wars, they usually seemed to come out on top through their careful alliances and sharp diplomacy.