Tim Cook speaks slowly because he is choosing his words carefully and thinking about what is coming out of his mouth.
It is refreshing. It's far more common for people to speak quickly, use a lot of words, but not really say anything at all.
I don't see it as a sign of lack of charisma. By the end of the talk his passion for Apple shone through.
Even better is he didn't need a TV monitor with words on it to tell him what to say. Bravo Tim!
