People's complaints about the writing were not universal. More importantly, they tended to be focused on world building and quest design rather than the player character. So rather than fixing the things people didn't like, Bethesda has decided to go after one of the things people did like. Of course people aren't going to be pleased.
It's like people wishing they could lose weight easier and so you chop off their arms and legs. Sure, they lost a lot of weight, but that clearly isn't what they wanted, so don't try acting like you did them a favor.
And I don't see why you'd bring up Bioshock Infinite. Bioshock Infinite was also a very linear game that's narrative simultaneously emphasized the importance of choices while commenting on how meaningless the majority of the choices you make in video games are. The nature of the PC demanded a voice, not because people would like it more, but because it was necessary to tell the story. More importantly, you were always Booker Dewitt, who was a predefined character with a predefined backstory that the entire game's narrative was built around (contrast that to Bioshock, where the story is all about Rapture, so no need for a voiced protagonist). Also, Bioshock Infinite was one of the best written games I've seen in years, and I doubt that Bethesda is going to get anywhere near it.
I couldn't get into Mass Effect because I thought the voice actor for the man was atrocious. The woman was better, but I was renting the game and decided my time would be better spent elsewhere so I stopped playing.
Fallout 4's male voice actor is also horrible sounding from everything we've seen so far.
I would give them a break if they had shown me anything as an act of good faith that would make me feel like extending the benefit of the doubt to them. But, most everything I've seen story wise is a red flag, and if they're leading with their best foot forward, that's a bad sign.
Also, I'm not going to play ball when someone goes "We've put a lot of work in the story because the story is important and this game is about story. But we won't tell you anything about the story!"
I draw a line of difference between RPGs where you play as a character, and RPGs where you make the character you play as. Fallout and TES are the later, the Witcher, Final Fantasy, and Bioware's stuff is the former. In the latter you are playing the role of the character. In the former, you are guiding the character. Nothing wrong with that approach, but it's not the approach that Fallout has traditionally had, which was one of the things that appealed to me about it. All of the "We want to be Bioware" signs that Bethesda's riveted to the Soul Survivor's face are a turn off for me, because I don't buy Bethesda games to play Bioware games. I buy Bethesda games to play Bethesda games.