Well, because of stuff like this:

I've always been a huge fan of The Guyver!
Besides that, it put a deadly spin on the term "killer rack".

Yes, ladies. That's exactly how someone feels when you shoot them down and have a great pair.
Ha ha, unnecessary vulgarity aside. It's a great series/manga. Along wit' shows like: One Piece, Full Metal, InuYasha, some o' the Gundam series (I've always found Master Asia hilarious!), Cowboy Bebop, Samurai Champloo, FLCL, Big O, Bleach, Naruto, Baccano, S Cry Ed, Blassreiter, Guin Saga, even Tekkaman, oh and Ultimate Muscle, Shaman King, and the Devil May Cry anime (Capcom, give us back our sons!).
Super ultimate main point:
I love violence, and don't mind spiky hair!