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No, pirates are quite good for their first level on the sea. They move quickly around the ship, and if you also cast a speed spell (by the way, it's the most common spell, and scrolls are often found) or something like Bloodlust... The only thing is that 1) they are not needed on land, and there are not that many sea battles; 2) they can also lower morale if you are playing as a good faction.
Варвары рулят!!