Its not a bad skin, in fact it is quite good, but for a Mythic skin it is lacking. The biggest issue with it is that it only has five customization options. A far cry from the 11 that Genji had with his Mythic skin.
The customization options themselves are also not very inspired. You can change his bow, and his color, that is it. The bows are cool but only the player using the skin will be able to see it most of the time. The colors I will admit are cool, except for the grey one. Out of all the color options you could have given him like green, purple, or gold, he instead got boring grey. Which makes him looks like a character with missing textures.
Furthermore, Mythic skins are meant to be unique and different to each player, hence why they are its own tier. Yet, this skin will just look the same for everyone a part from the color.
There are a lot of other customization options that could have been added to this skin:
Changing the shoes
Changing the hair
Changing the tattoos
Changing the shoulder armor
This is a good looking skin, but its not a Mythic skin, it is a legendary skin with color options.
fact is, this Hanzo mythic is straight up insulting. Blizzard just thinks that they can get away with half-assing skins because people will eat it up anyway.