Being Belgian I probably am somewhat biased, but I think Belgae make sense as a faction. Although Caesar was known to be self-aggrandizing in his writings, painting his opponents as valiant or having huge numerical advantages, in the end: "Horum omnium fortissimi sunt Belgae, propterea quod a cultu atque humanitate Provinciae longissime absunt, minimeque ad eos mercatores saepe commeant, atque ea quae ad effeminandos animos pertinent important ; proximique sunt Germanis qui trans Rhenum incolunt, quibuscum continenter bellum gerunt".