The entire appeal of the Manic Pixie Dream Girl is that she is wierd and outrageous and magical and unusual. The entire premise is "my life was boring and adventureless until she came into it"
Which means that the person it's meant to appeal to is supposed to be an everyman type character. That's the point of the contrast, the normality and rote being shattered by the strange and eccentric.
And it's disappointing that so many people seem to hate this, as it's a pretty fun trope. Like, yeah, it's bad when used badly, when the character isn't well written or it's overly fetishistic, but every trope is bad when used badly.
Used correctly, it works fantastically as a narrative hook
