Quote Originally Posted by Animeniax
For Lee it's more than just a choice to use his chakra only for Taijutsu. He can't use ninjutsu or genjutsu. I figure it's like each skill or technique is like a puzzle. Some people can solve the puzzle with practice and use the skill, and others can't. Some get cheats like when Naruto read the scroll and learned the kage bunshin technique, or are shown how to solve the puzzle, like when he was taught rasengan. Some have a natural affinity for solving the puzzle, or get the answers via a bloodline technique like the Uchiha sharingan. Mostly it's just practice or natural skill. Lee is just dumb when it comes to puzzle solving. The rubix cube would put him in a coma.
That's a nice analogy, except it implies that Lee's faults are a result of a lack of trying. Lee's just not good at anything, even Taijutsu (I remember Neji saying this early on). He's only good at Taijutsu because he was able to practice it so much. I think that if he had the ability to use nin or genjutsu at all, then he would have practiced it 'til he killed himself.

He's just defective in that respect, I think, not dumb.