Miis are just a front end for a user's meta data (if thats the right usage of the word), If more games used this data, not just for Mii's it would be very cool. You could start a game of say COD and the character you are using could instantly have your hairstyle, eye colour etc but represented in a realistic fashion, rather than the Mii look, instead f going though the boring proceedure we see n games like Tiger woods.
I'm sure this is nintendos ideas, yet as far as i know they have only released information how to access the data off the wii to a small number of developers.
I dont think the Mii graphics need a overhaul really, a few more options with the range of hats etc maybe but too many options just result in the player making silly characters rather then true representations of themselves, which is the whole reason it works so well in the first place.







