Christopher was a good character for the show, as he added to the drama and also had some great funny moments. Moreover he really wasn't the brightest bulb in the chandelier.
But I always wondered why Tony hadn't whacked him earlier as he - due to his massive drug abuse and emotional instability - posed some danger to the mob family.
Btw I loooooooooove the chemistry between Gandolfini and Falco that was really sth special.
God, how I miss the show.