Quiet/Silent characters are neat and cool... When they're the main protagonist and all other characters are drawn to them for plot-reasons. Unfortunately, as seen in "No matter how I look at it, it's your fault I'm not popular!", when you're not in a story and ain't the main character, being the silent/quiet type doesn't really do you any favors... :P
Just like in real life! 8D
Who woulda thought that people would prefer to interact with vibrant, outgoing and talkative individuals, over silent, taciturn and stoic folk? :o