That is definitely a complaint I can agree with. For a while I wasn't even sure they had managed to get the same actor to voice Kratos as he didn't seem to have any speaking lines. It's definitely a bit strange.This.
Kratos not saying much is really kind of surprising.... not that he was a chatterbox before, but I honestly don't remember him ever being THIS quiet. It's disappointing although I am still enjoying the game for the most part.
I appreciate that the cutscenes mostly appear to be realtime, however. The PS2 games were terrible in this regard as they both relied on poorly compressed videos to tell the story which made for a large disconnect. GoW3 was an improvement but still used video regularly. Ascension seems to go realtime for most normal scenes, however, and blends into the gameplay seamlessly.