The Jedi code was loosely based on Taoism, Buddhism and bushido code. Which of course there are some cross purpose ideals in each. While similar ideals, they don't always match up. Now, why is the voice acting the way it is? The director most likely asked them to be contemplative and introspective, as this is the class that is considered to be the archivist or historians of the Jedi order. They spend a great deal of time in meditation. Have you ever talked to someone who spends a lot of time meditating? Neither have I, I generally fall asleep a few minutes in. One of the few I did not fall asleep listening to was the Dalai Lama, he does indeed have a keen sense of humor, most meditationists however do not have the enlightened view he has.
Still the Jedi characters in movies, cartoons, tv series are much more fun to listen to to Nolan North. I have great respect for Nolan and as I said it's not that I really dislike it, but comparing it to the other voice actors in the game I rate it the lowest.
The new one I like really much