I get that new, weird, unique lineages appeal to some people, but it's not for me.
I'd rather be given more of what I already know I like than see space and effort given to untried, off-the-wall stuff that I can't relate to. Without a firm focus on those core cultures, it stops feeling like D&D to me; it needs certain elements and essential touchstones present in order to maintain that D&D ambience.
Some of the best campaigns I've ever taken part in have consisted of nothing but humans in low/no-magic settings.
Besides, as a human myself, I sort of resent the implication that characters aren't interesting unless they belong to some heretofore unheard-of species.