No Varo disaster. The Germans are colonized and Romanized. The new province(s) aren't that rich, in terms of gold, but have minerals, good agricultural land, and a lot of good soldiers. These resources are used in the first 20 years after conquest to periodically re-conquest the Germans (Vercingétorix v.2.0, 2.1, etc) until pacification is achieved.
Afterwards, the Romans don't expand much more in central Europe, too many problems elsewere, but make many Slav tribes tributaries and allies. Roman culture irradiates to Eastern Europe. When the Goths arrive there, say 2 centuries after, even before invading roman lands they meet stronger, more sophisticated, semi-urbanized tribes that put a bit more of resistance to their advance. More important, the Goths learn to value things like writing, centralized organization, and bureaucracy. They're halfway there!
Then those unreconstructed barbarians, the Huns, appear. Rome activates the Slavs alliances, the great German soldiers, the Goth refugees...and gets trumped up, but not nearly as bad as in OTL. The Empire is in decline, for economic reasons and civil strife, but the Huns don't make it to Rome's portas: they are stopped at present-day Munich.
The Empire falls, perhaps a bit later. It falls because the Goths are unassimilated and agressive, General A is busy fighting General B and C, and the economy doesnt' permit the fielding of decent armies. The Empire was partitioned before, let's say the Easter Empire gets spared (it is a coin toss, really).
But now, the barbarians aren't that barbarous. They are more cultivated, love cities, and everything else. And Germania is a urban country that has been unified for centuries and has a national identity that permits the creation of a German national state in the XIII century.
Still a lot of fighting and general nastiness, but better that OTL, especially for the Germans.