The marines are something of an elite unit, while your average legionary was just a salaried grunt, so I am not sure if they are comparable. For example, in "In the Name of Rome", Goldsworthy writes that when Corbulo was preparing for his Armenian campaign, he found that some of his legionaries had actually sold their armour. That does not speak of a high regard for their equipment. IIRC the Eastern provinces were considered as easy spots, so this may not be representative. But the degree of combat readiness probably varied over time and space.
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