The legend of Boudicca destroyed.Watch
Then she made one of the most stupid decisions an opponent of the Romans could do, fight them in pitched battle, a venue where the Romans were experts. While sources may be slightly skewed accounts have the indigenous British peoples casualties at 80,000, the Romans at just 400. Boudicca was a joke. What type of idiot fights the Romans in pitched battle? Even at the time it was known how impressive the Romans were.
An all round stupid character was Boudicca.
Also the figures you quoted for the campaign in the ancient sources are regarded by modern historians as extravagant.