I think dumbledore was supposed to come off angry in parts of the fourth movie, as thats what came across to me when I read the books, though the fourth was my least favorite anyway.

Anyway, the only reason the more recent movies (third and fourth especially) failed to better capture the scope of their respective books is because the writers intentionally left out essential plot details that have taken just a few minutes to add in and replaced them with totally pointless but "exciting" action sequences.