Larian has english accents for everything. It makes it sound more fantasy-ey
Baldurs Gate on the other hand was a total mix - it was kind of interesting.
Lots of NPCs didn't have english accents (Imoen)
But then again this game has nothing in common with Baldurs Gate except the name so maybe that's not a good comparison
Be mindful of the fact that the studio's location also plays a part in who they hire to do voice overs for their games.
I know accents and dialects can be faked, but keep in mind Larian's offices are located in Europe. They have multiple sites but I believe their branch in charge of the recording studio is located in Dublin.
The original BG games were made on the other site of the Atlantic, so it was much more feasible to hire local VAs.
