It seems like during his era, whenever territory changed hands in Europe, it did so in small amounts at a time; the Partition of Poland took 3 wars with 3 world powers taking a small amount at a time. But then Napoleon came along and demanded huge tracts of land from his defeated enemies in a single war. What changed?
(Resubmitted since I accidentally a word in the originals title)
Generally, it's because of how terrible he defeated the various nations. The main goal that Napoleon pursued on the battlefield, straregically, was the absolute destruction of an enemy army by a massive victory. Napoleon didn't fight battles against a nation but against a nation's morale. So, by the time he got the enemy to the peace table, they were willing to give in to almost anything; Prussia gave up Poland in 1807, Austria lost Italy in 1796 and 1800, Austria lost Tyrol in 1805, and Austria lost Marie Louise in 1810.
Generally Napoleon had defeated his enemies until they would do anything for peace. However this was the Emperor's undoing because it caused a lot of grief for the conquered and finally turned bad when the Allies declared war in 1813.
Partition of Poland and Grand Dutchy of Lithuania*. Just so you know.