On the topic of voice acting, I think Skyward Sword does a pretty good job on having everyone silent, and only text and grunts. I know this because if you look at some cutscene, preferably the ones with Groose as an example, are great even though it doesn't have voice acting.
Point is...
These aren't flaws, but more of your own nitpicks about the game. Some of them are very invalid such as: "the Silent Realm is a missed opportunity, how it isn't a threat."
The SR is more of a test than actually a threat. And voice acting isn't needed to perfect a game. Some games have great...