They definitely could have improved on their storytelling. As for the acting, personally I thought it was mediocre (on pretty much all voiced characters, the only two that stood above the rest were the King and Urbosa); I've definitely experienced worse before. I tried to remind myself that sometimes even good actors can be ruined by bad writing, so gave her (Zelda's actress) the benefit of the doubt. It seems to me both story dialogue and dungeons may have been late additions in the development cycle. Hopefully they will improve on these weak points for the next major title. Actually, I found some of the voiceovers made by Zelda Universe on some of the older games to be on par with (if not better than) some of the voice acting that appeared in Breath of the Wild...