What I find odd is, that the problems you're describing is with "remote" characters, such as the Briar-wolves or the rescued Elves in Dun Mora (DLC "The Last Stand").
But what counts are the main characters, such as the Avatar, and since SF2 the heroes. Main NPCs like Prof. Twiddle or Flink McWinter. All these have not been mentioned so far and from what I got in the DLCs and FiD from English Voiceacting, that was pretty good.
It was even that good, that German gamers, switched to the English version, because they didn't like the German version of FiD (not so, with the DLCs!).
Just my two cent