What I have read about the early germanic tribes (300BC-100AD) I get the impresion that these people very spartan..
They did not like cities and did not create many stunning pieces of art like the celts in this time period and prefered a simple more simple life.
I personally think is a big reason that the romans where very successful to romanize the gauls but roman attemps to civilize the germanics where largely unsuccessfull...
Centuries the germans started to be more interested in Roman culture but not in the way that the Romans had in mind
And about germanic art
In the time period of the wandering of the tribes and the early dark ages the germans did create stunning peices of art but that is much later.