For years, the entire family was convinced he was a Squib, can you imagine that? In a family of purebloods? Neville Longbottom is the one who tells Lord Voldemort to his face that he'll join him when hell freezes over. He kills Nagini, the last Horcrux, the last thing standing between Voldemort and Death. I love other characters, and I admire them so much, Here's to you, Neville.
I still say he was a dick father. Yes he loved those boys, but he was abusive (as Dean alludes to on more than one occasion) and he was so hell bent on revenge that he neglected to be a dad. Him sacrificing himself was his way of finally showing the boys exactly how much he did love them.