However, I wasn't a fan of the voice acting as a whole,
This is definitely hit or miss. I actually like the voice acting because I felt like it added to the atmosphere of the game - everyone and everything in it are messed up, so the voices being a little 'off' made sense t me. Sometimes it was just plain bad acting, but yeah.
The atmosphere itself was immersive, but I didn't really have a chance to REACT to this world like I wanted James to react. Everything felt sort of "this is happening because it's happening." Not "this is happening and HOLY **** this is happening."
This is something that confused me when I initially played it but really appreciate when I finished it. James doesn't really react to a lot of the stuff he sees because, in truth expects it. He basically wants Silent Hill to punish him, so he doesn't particularly care when it does. Some of the transitions are jarring, but I felt like that also added to the weird atmosphere. Also hit or miss and I can see why it would be a Miss foe you, but yeah.
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Black Turtle did a pretty good job.