With the numerous Star Wars RPG's that have existed, I've RP'd many a Jedi. Its tough, but an interesting experience. The main trick is finding the balance between the "rigid inflexible meditative version" and the "applicable to actual life version" for that particular Jedi. No Emotion really come into play more as focusing lens for what needs to happen in a situation. As someone said earlier, no sentient creature can banish all emotion or even repress it for too long. Emotional responses are typically our gut instincts in a situation. Sometimes that gut reaction is right, but most of the time it is not. Jedi seek to push past that initial emotional reaction in a situation, bringing rational thought and guidance of the Force to seek solution.