You typify the arrogance around on digital forums. Attacking me for not posting sources whilst launching into a jeremaid of your own, one that (hypocritically enough) lacks any sources. But to end all arguments. Here is a 'second edition' of my comments, with sources.
On German Cavalry. Pharaphrasing of quotes.
'Rich men existed and provided the cavalry... German cavalry did not go in for flashy foreign bred horses as did the Gauls... Their native breed, described by Romans as being 'Small, ugly, and not especially fast'... They did not use saddles and wore very little armour... Weilding light spears and javelins 'framea' (swords were not universal)... The effectiveness of German cavalry was increased by having an equal number of picked light infantry attatched to it in support'
Lastly, the standout quote: 'Although the cavalry were effective, Roman authors still thought the infantry who made up the vast majority were the most dangerous'
It goes on to say the Germans did not seem to have won any pitched battles against the romans (Teutoberger Wald was an ambush, so don't bring it up.)
Further: On Gallic infantry.
'The best equipped carried a long stout sheild, a bunch of javelins and a long cutting sword. Roman historians tell us that the metal of the sword was of poor quality and needed to be straightened with the foot after a few blows... The biggest problem for a Roman general facing the gauls was a lack of suitable cavalry to oppose the Gallic horsemen and a lack of light infantry to scout out woods and defiles,'
From all this we can clearly see.
1) German cavalry were slow-moving, lightly armed, without armour and needed light-infantry escorts to be effective. We can deduce from Roman opinion; they were the least decisive force in the German army.
2) The vast majority of Gallic infantry wore absolutely no armour and carried light javelins and poor quality swords. Also that the Legiones (Heavy infantry) had no troubles against unsuported Gallic infantry in a pitched fight, despite the relative size difference (Gauls were said to be much bigger) and were only concerned when there was cavalry support present or if they were ambushed.
I shall list my source: Phill Barker's 'the armies and enemies of imperial rome,' sourced;
Journals:
Journal of roman studies
Brittania
Original sources:
Ceaser, the commentaries
Plutarch, lives
Tacticus, The Histories, The Annals, Agricola, Germania
The Vitea Augustae
Julian, Orotations
The military works of Frontinius, Onasander and Vegetius
Modern authors:
G.Webster, H. Russell Robinson, H. Delbruck... I could go on. But copying this out is getting dull. You get the idea.