Masamune looks like a plastic toy? Its widely regarded as one of the best looking weapons in ff history.
Matter of opinion. Justin Bieber is widely seen as a genius by a certain category of people, is he one? Exactly.
Problem in the case of Masamune is that the opinion is influenced by the fact that you get it easily and is a good weapon.
Also it's an "original" shape/color, no wonder why people familiar with other MMOs and their cartoonish colors like it.
I liked the first skin of Masamune better (pre-2005), it was the skin of Onimaru.
Actually, Amano is a real GK that has existed, not Masamune (the shape).