Sometimes I think even reading about character interpretations are an exercise in frustration. Discussing them can be too. Which is why I don't often bother.
Looks like Demyx will be the character that continues to divide the fandom. Honestly, I think most of the "divisiveness" is found around him. What his personality is, whether he is the "good one" or just as "mean" as the rest of the Organization, who he's paired with, who he isn't paired with, bla bla bla.
The manga doesn't seem to make it any better, but I guess there will always be splits in such a large fandom as Kingdom Hearts. I mean, Harry Potter is even worse. Heh.