I agree. There are a couple of groaners from him, but overall, he just came across weird with his delivery, especially when he was trying to express anger and/or disgust. It made him seem like, well, a little kid. I know he is a little kid, but I just think that as someone who turns into Vader, he should have been more mature. Lucas seemed to be trying really hard to get us to care about the little squirt, by making him yell "YIPPEE!" I think if he had played more on the sad little kid thing, it would have come across more sincere, and made me care more about Lil' orphan Annie.