I played Russian versions of both TW1 and 2, and both were pretty terrible. May be it is just me, but it seems Russians tend to over-act.
I like English versions of TW1-2 more then any other and now I play them exclusively. It's interesting how an attitude toward some character may change depending on a voice acting. I really like Henselt, for example, due to a great voice acting, and I always regret when I get him killed.
Polish voices are great. I know English version by heart already, so I do not need subtitles, but I regret that I do not understand what they are literally saying.