I think Larian has found a good middleground between voiced and unvoiced PC. Some scripted scenes such as when you first go to camp or when you're traveling and your PC comments on something are more than enough. Dialogue choices shouldn't be voiced because it allows for more flexibility in terms of roleplay options. Perhaps sprinkle a couple more pieces of PC voiced dialogue throughout the game, like when you're getting whipped by that maniac in the Goblin camp (forgot his name), your PC could audibly scream if failing the [Constitution] check.
