they weren't overrated Boudicca was a excellent leader but not such a great tactician the roman towns were not well defended and the ninth legion if I remember it correctly was ambushed after travelling a long way to relieve a besieged settlement. she got her army massacred at the final battle even after outnumbering the romans 10,000 men with , 100,000 Britons. note the romans lost only 400 to her 80,000.going by tacitus claims. the Britons cut off there own escape route with there own baggage wagons letting the romans slaughter all the men, women, children and even the animals. (the battle of Watling street)
anyway the picture is a awesome piece of art.
I'm thinking of times like Teutoburg, Cannae, Carrhae, Adrianople, the times that the myth of the invincible Roman military machine was proven totally false
No one talks about the weaknesses in Roman style fighting- the TOTAL dependence on formations and how they really only worked on flat surfaces. It worked only because their "barbarian" enemies were disorganized