I really liked the characters in XIII and their voice acting for the most part was of good quality, but I do admit that I've always felt far more attached to non-voice-acted characters (X and XII were terrible from my perspective). I think it's because you get to put your own voice to a character in your head as you read things on the screen. It also allows you to better connect with the music, I find, which might also add to the emotive aspects.