personally, i think she was overscored. However i thought all skaters was overscored at the olympics. Mirai wasn't overscored since all was overscored.
she was scored correctly compared to all lady skaters. she wasn't overscored more than others . compared to the womens group she was scored correctly, but for me a tad high.
I think people were so jubilant that the final six skated so well and so cleanly that they probably handed out high scores like candy just in sheer celebration. It really was an Olympics for the ages, led by an extraordinary skater, YuNa, who completely lived up to her potential, and followed by a few skaters who toughed it out and kept up with her.
So often in an Olympics the heavy favorite has some difficulty, nerves or an injury, or just an off night, and other skaters also succumb to nerves. It's very rare that the best skaters have the skate of their lives at the Olympics--Boitano's long program in 1988 is one instance that comes to mind. On that night in Vancouver in 2010, pretty much everyone reached or exceeded her potential, Mirai included.