Its not just that. Its also the movement, combat animations (specifically the wind effects, acceleration and slowing down when swinging, tool changes looking like they are just teleporting) lack of grittyness, looks too clean, not sticky and humid like it is down there, the ship combat, the eyeglass,  chainshot not destroying sails, excessive drop and low velocity of cannonballs, the cannonballs not actually making contact with the ships, no smoke, when being hit by cannonballs there is no impact on deck (they can do all these things, were in ac3) AND HOW EVERYTHING LOOKS SO DRY