The game has awesome graphics. However two pet peeves:
Occasionally, AI ships will sail through land masses. Don't know if this a result of how their routes are plotted or whether there is no programming to prevent. Either way its distracting.
Night falls suddenly. Rather than the gradual shifting of hues and light which occur throughout the day, when midnight falls, there is a sudden change in coloration and lighting--plus sometimes there a visible blocks of the screen that do not change at the same time as others.