SHE rented it. I figured it wasn't worth more than a word. But since you asked...
Dodgy CGI.
Laughable shark.
Worst accents ever (French/Spanish man, Jive and English-to-South African).
People repeatedly saying "dawg".
Not as good as "The Day The Earth Stood Still".
Flimsy plot.
Stupid bit about "The Guardian of the Black Cove", as told by the French/Spanish man.
Frankly ridiculous and cliched good guy & ex-wife plot.
Complete and total load. I'd rather have my bell-end pierced.