I absolutely think the Zelda games need voice acting. I never felt I was the hero in Zelda, I never felt I was Link. I always viewed him as his own character, and never seen myself as him. Should they make him talk? I'd personally like to see him become his own character, but even if they choose not to make Link have a voice, the rest of the cast need to have one.
Mario games, on the other hand, don't need to speak. Their gibberish is what give them their charm.
As for Metroid, yeah voice acting should be in it. I don't really think it needs it, though. The first two Metroid Prime games got away with it, and did fine. The third one and Other M was "eh" in that department, but it'd mostly depend how it'd play out.
I don't know why people tell me to get a life. I'm a gamer, I have lots of lives!
