Fascinating setting with lots of opportunity and conflict.
Not necessarily as narrowly aquatically focused as you might have thought, though the sea slays plays a big role in the setting.
Somewhat like Shadowrun is cyberpunk/fantasy, Blue Planet is WildWest/cyberpunk, depending upon how you play it.
The system itself seemed fairly streamlined, and efficient.
For me, the big draw was the imaginative setting in an enjoyably written book.
[5 of 5 Stars!]