I have been playing the Witcher modded to the Polish version, and I have to say, after hearing the English and Polish versions side by side, the Polish one kicks butt and takes names. It has much better voice work than the English one which is pretty uninspired.
Of course, years of watching Hong Kong martial arts and action films may have inured me to subtitled viewing, that and playing Stalker lots recently. Still, the emotional level is much better on the Polish version. IF they don't do as good a job on the new release, I may never play that one either.