I don't like the whole completion percentage in the character profiles section. It encourages metagaming, and it means we can get all available info on a character in a single playthrough. It breaks the illusion that you're talking to actual people, as getting to know them is turned into a mechanical side game. It's analogous to what Bioware does with its games' characters and it sucks.
It would be a lot better if certain choices during the game got you different, mutually exclusive bits of info on the characters, and if you were never sure you had gotten all the info there was to know about the characters.