Agree with OP, its annoying. A few characters here and there like the primals or even some of the beast races? The Slyphs are great, for example.
... but there is no reason why every single character needs to speak like some overzealous renfest nerd. Furthermore, can we give them more character? Elezen, French? La Noscea>English/Scottish with a lite pirate-ish twist? I dont think an Arabic accent would work with Uldans, at least not a heavy one, but anything would be better.
They must needs change it! <== see? Annoying. Bad VO is pretty common in games and can be remedied here with the different languages but that just makes the text that much more aggravating. This isnt a Shakespeare novel! There is a reason why middle-age themed, high fantasy books and movies/shows like LotR and Game of Thrones avoid or minimize it as much as possible. Its distracting to the audience, taking away from the experience. Can you imagine a Game of Thrones where Tyrion keeps putting in a "must needs" (yes its that annoying) every time he suggest someone "must" or "needs" to do something? No amount of blood or boobies would save it from being canceled.
