Also, Portman's a joke. She was and still is a poor actor. She's a pretty face, nothing more.
Her performances in Star Wars ranged from bland to uninspired. On the other hand, she was mainly working in front of green screens and reading Lucas' tin-eared dialogue, and that's not a situation designed to show off any kind of range or depth as an actor.
But she's also the actress who went on to do much more impressive work in Cold Mountain, Brothers, and some other very good movies. (Admittedly she's back to wasting her time and talent in the Thor movies, but I bet her rent checks aren't bouncing.)
Not to decry or support Miss Portman (I liked Black Swan, though), but a grand total of 2 actors managed to even look alive and neither of them were Samuel freaking Jackson.
If Samuel "badass motherfucker" Jackson can't act as anything but a robot, it is no longer a problem of actors regardless of their talent
Huge props to Mcgregor and even more to emperor Ian McDiarmid for getting some semblance of emotion and creating something fun out of that dreadful experience, respectively