All of the Oreo flavors look disgusting to me. There's no way the mint can be as good as grasshopper cookies, so those are out. I don't know why I need cake flavor when the cream is already frosting. the cookie dough sounds nasty, and why do I need a cookie flavored like a raw cookie? I think you were right about there being a watermelon, that's probably the worst of all of them.
I think the Halloween ones are better than the regular. I'm sure it's all in my head because I'm sure there's no way orange dye can make something taste different, but to me the orange cream tastes better than the white.