Yeah.... I don't get how someone could say the Sharkee's in AGDI's KQII don't make "sense". It's not that hard; Graham goes to an underwater realm - the Mer-people are having problems with the Sharkees and for them to help you, you have to help them. Not a whole lot of non-sensical stuff there.
I mean, I could understand someone saying they didn't LIKE the Sharkee's - as if their design was poor or they didn't care for how they looked... but to say they don't make "sense" is pure poppycock.