What about voice acting? its general quality? its immersion factor (which is dependent on its general quality)? how much there is? how little?
Anyway...
Voice acting is a great feature, but also a double-edged sword. It can greatly improve immersion, and give the sense of a living world. It relates to the old screenwriter's axiom "show, don't tell". And as Yahtzee pointed out in his review of Final Fantasy XIII [http://www.escapistmagazine.com/videos/view/zero-punctuation/1569-Final-Fantasy-XIII], "you're supposed to weave exposition into the narrative, not hand everyone a fkng glossary...". On the other hand, bad voice acting can ruin an experience. When the voice doesn't match up, or the dub is just bad, or voicing is completely irrelevant, all of that shatters what voice acting is supposed to create. Taking other examples from Yahtzee: Metroid: Other M [http://www.escapistmagazine.com/videos/view/zero-punctuation/2015-Metroid-Other-M], and LA Noire [http://www.escapistmagazine.com/videos/view/zero-punctuation/3347-L-A-Noire].