I have to agree. I don't remember who the voice actor was, but he did the voice for King Oberon and the Arch Druid. I liked all of the voice actors for the other characters. I found them to be, for lack of a better word, "fitting". Even the voice actors for the Guard Dogs did a great job. I just couldn't understand how the voice actor for King Oberon/Arch Druid was picked. Not to say the voice actor was bad at what he was doing, but I think a casting director should know what voice would fit with what character. In KQ7, King Oberon had a thunderous voice, much like Zeus from the God of War series. Arch Druid in KQ6 had more of a elder, wise tone in his voice. Much like the voice of the other druid that warned Graham to not go sailing in the abnormal storm. Even then, the Arch Druid seemed to be darker skinned in this game, not to start a racial discussion, but I would imagine a voice would fit the ethnicity of the character as well.
All this being said, the voice actors (from what I'm told) have already been picked for the entire series of episodes, but I wanted to express my two cents.