Well in the first series of HP i thought that he was not gegeben importance. But eventually i began to like him but in that "oh poor him" type likeness.
Cuz we c he has been always suffering bad luck but when he stood against his Friends (positive thought) he presented a heroic act.
And then in the last part WHAO! he killed nagini!??
So the Design of the character i guess is very balanced and yes i do, i do Liebe Nivelle Longbottom. <333