It's funny because a lot of people used to complain about how 'fake' Leliana's accent was when the game first came out...
People who actually don't know how a French sound when speaking in English will always complain that the accent sound fake. Usually, it's just because they don't like it. There is also a lot of variation, a French Canadian doesn't speak like someone from France in English (best example: Batroc the Leaper in Captain America: The Winter Soldier movie, GSP has such a strong French Canadian accent, but the entire group is supposed to come from France, it was just bad to my ears).
I personally found Leliana's accent really tame even if it is exquisitely French, but then I get to hear natural french speaking people talk in English almost daily so...