I actually think Nintendo's technique of not giving main characters voices, and generally not doing a significant amount of character development, is a deliberate and very effective technique; it allows the players to give the characters whatever personalities they see fit to.
It's like reading a book as opposed to watching a movie; in a book (or a game) we can give the characters whatever voice we dream up for them, but when we actually hear their voices, it's almost always a disappointment.
I'm glad Nintendo doesn't make extensive use of voice acting.