I second what Mezhu said. I'm, maybe, not the best captain in this thread, but good crew makes Galleon do wonders.
Buuut... he also need a decent ally and tactics. If you pick galleon with Hwacha and Carro in Dunes against merk\artemis pyramidion, you will be, of course, in tears.
But in Ambush, or even Paritan Rumble, you can deal a lot of damage, even to experienced crews.
Only thing, that, i think, must be improved - it's, maybe, rebuild time on big guns. But... thats just thought.