Lecturing me on series I know like a back of my hand, ey
I won't proclaim to know the series "Like the back of my hand." I didn't read the books, I've mostly read through several discussions about them though because I'm interested in reading them in the future. From what I gather. Mutations are meant to strip emotions but due to additional experiments, Geralt retained some of his.
Quotes from a discussion about the books and Witcher emotions.
From 'The Sword of Destiny,' Geralt to Yen:
"And from that pristine whiteness, spring emerges," he said "And Aedd Gynvael appears, an ugly city with a beautiful name. Aedd Gynvael and its pile of trash, a huge stinking heap of garbage that I have to enter because I'm paid to do so, because I was created to deal with the filth that fills others with fear and disgust. I have been deprived of the ability to feel, so I was not able to feel the horror of that disgusting squalor, so I would not retreat nor flee before it, full of dread. Yes, I have been deprived of emotion. But not completely. Whoever did it, botched the job."
The newest book, Season of storms has a quote that goes something like this:
That was hectic - Sighed Addario Bach, as soon as doors shut behind the three - Dammit, my hands are still shaky, yours aren't?
No - Geralt smiled at his memories - in that regard i'm a little... handicaped.
Mutations as a cause for the lack of emotions are also referenced several times ingame.
Baron: "You're a cold hearted bastard..."
Geralt: "The mutations worked, then."
There's another quest which Geralt warns the actor troupe of his lack of emotional expression.
And of course
From what I understand, the common folks see Witchers as "heartless killing machines" And from this fans have interpreted it as Witchers believing the gossip said about them. Once again, this is fan interpretation not a real answer. IMO, I find it difficult to believe that Witchers wouldn't know whether they have emotions and thus must rely on gossip to tell them about themselves. However, Witcher's aren't heartless killing machines, it's an embellishment. They just don't feel the same as regular people and Geralt is different overall, but still not the same as normal people.
As for his love of Yen, Triss, and Ciri. I do think Geralt loves them and have a deep bond with them...*for him*. Not as a regular person.
As for the Polish VA. Never heard him. If his selling point is him being more expressive, then I'm not sold on him over the English VA.
Edit: I'll drop it, As TheOrge said, it's a discussion that's more about personal tastes and would just be a back and forth