At least Itachi is more interesting than Kimimaro .. Kimi is about as exciting as watching paint dry .. or maybe even less so. Although both of them suffer a definite lack of personality. Orochimaru is so much more expressive and interesting, because he doesn't look at every situation with a totally blank stare. My favorite villains are the more colorful ones, like The Joker in Batman (Jack Nicholson pwns!), or Dr. Jackal in Get Backers (he always got so excited to get into battles .. and creeped Ginji into turning into Chibi-mode .. rofl! .. 'BAN-CHAN!!!') .. or even Zabuza, whose overt cruelty and vengeance made him compelling.

I guess Kishimoto is trying for a sense of mystery or something with the whole expressionless thing, but to me it's just plain boring...