DOOM has an obsolete engine, yet how many decades later we are still playing it, has no voice acting... yet we still love it. Same for Wolfenstein 3dGonna have to go with the "new engine" crowd on this one. That creaky old brontosaurus they've been using for god knows how long needs to die.
Also, if you're going to have your game fully voice acted, PLEASE for the LOVE OF GOD ensure the actors have enough range to voice multiple characters, so we're not going "Oh **** it's that guy again" (you all know what I'm talking about). I understand it's no easy task with so many NPCs, but come on man, even Paw Patrol does that (sorry, my little nephew went Paw Patrol crazy this Christmas).