Answer: Germania was never to be as Romanized as Gaul.
The Battle of the Teutoburg which took place in 9 CE was described by the Roman historians as the Varian Disaster. It was when an alliance of Germanic tribes ambushed and decisively destroyed Roman legions. The victory of Germania was the turning point in Rome's territorial ambitions. They never again attempted to conquer Germania, who was never to be Romanized as Gaul.