The Emperor sounds more angry and controlling in act 3.
When you visit Raphael and he gets blocked out he will ask you in a demanding tone what happened. And he tells you he couldn't read your mind anymore. He never said that he could read your mind in the first place. So that's kind of controlling.
When you go in search for Ansur he basically tells us we're wasting our time. Then we find out it's because he has yet another thing to hide from us.
After we finish the House of Hope he snaps at us and calls us foolish. This would be reasonable if it was because of Raphael. But for him it's more about us acquiring the hammer.
He doesn't want to extend his protection to Minsc because he thinks he's beyond saving. Turns out that's not true.
But the silly thing is that he never says anything when we run around aimlessly trying to find all of Dribbles' body parts. Or put ourselves in danger with Mystic Carrion, etc.
If the made the Emperor sound more like act 1 and 2 I'd probably be more trusting towards him.
