I talk to myself out loud almost all the time anyway, at least when I'm thinking. So if I'm playing something mindless while eating lunch (FFXIII-2 comes to mind, at least during the combat sections), I won't, but at all other times it helps me get immersed into the game and understand what is going on better. Actually, people hate watching TV with me, because I always end up commenting to myself about what just happened and what I think will happen.