I hate it when the main character is completely silent. I don't really look for a grand role-playing experience when I play a game---I like the whole interactive-novel feel. I want to get close to these characters; that's not really possible when they don't say a word (I'm talking only about the main character).

Although I do enjoy where you get to pick your lines, every once in a while. That makes it a little less...monotonous, maybe.