I know the feeling. I could barely stand the sounds a Breton makes when being hit in Morrowind. It was something so trivial, and not even heard very often, but it just made me cringe.
The PC in Knights of the Old Republic. I always wondered why he never said anything, except things like cycling through character selection, or when you pick locks. I never put two and two together with the "force visions." But then when I got to the revelation. I was like "so thats why neither of them speak." But the voice in general was just dull.
Aerie in Baldur's Gate 2? One of the worst VA jobs I've ever heard. Granted I havent owned a ton of games over the years. But she was just unbelievably annoying and whiny. A lot of people agreed with me on this one, and didnt like her for the choice of narrator of Icewind Dale 2. Now the narrator of IWD? Nice job. And great twist at the end. I still cant stand Kath Soucie, and she seems to have a very limited range. The BG and IWD series in general, the majority of the dialouge was text based, except with characters who had larger rolls. If you talk to a townsperson or a traveler, they might say their first line, but the rest of it was all text that you would have to read. But Sarevok or Irenicus? All spoken. And Kevin Michael Richardson and David Warner both did amazing jobs. Some of the best voice acting I've ever heard.
As to the PC in BG, and the parties in IWD. There was a limited selection of voices for your characters. IWD had more choices, since you create all the party members. It even had a few class specific voices, like thief sets having lines about using stealth, or mages talking about fire and lightning. But again, the number of lines was somewhat limited. Character selection and action confirmation, combat taunts, badly injured, and so on. Conversations with townspeople didnt even have the first line spoken. Interactions between party members had the first line from each character spoken, but the rest was text.