Were the Germans physically superior?

[Epictetus]

As a few people have mentioned, Tacitus says that the Germans were tall, but I think it interesting that he hedges his bets on their strength and endurance:

[The Germans’] physique, so far as can be said with their vast numbers, is identical: fierce blue eyes, red hair, tall frames, powerful only spasmodically, not correspondingly tolerant of labour and hard work, and by no means habituated to bearing thirst and heat…

Tacitus, Germania, 4

There is a note in my edition of Loeb that vaguely and unhelpfully says “skeletal remains confirm for Germans part of what he states."