There's actually whole psychological studies into why silent protagonists like Red and Gordon Freeman appeal more to consumers, especially in videogames. What it boils down to is that most people prefer it, even if only subconsciously, because it allows them to play their own personality into the character, filling the character's reactions in mentally. When you go about the lab smashing equipment in HL2, your Gordon Freeman is doing that because that is how your Gordon Freeman acts; He's kind of a jerk. If you do that and then your Gordon Freeman were to say with an air of gallantry that he accepted whatever task was put before him, or had the utmost respect for the lab and its equipment, or whatever, it might be a funny scene, but it would be incongruous and break the suspension of belief.
On the other hand, if the hack tells a story about the character, especially one that is meant to be emotionally gripping, it can be used, since it's less of an RPG and more of an interactive story; If used for satire, I can see it being used successfully; And it is alright for internal dialogue- Red even has this, as do the rest of the Pokemon protags.