1. Planescape: Torment (BioWare and Black Isle in its best, old RPG's were something made with passion)
2. HoMM III (compulsory element on the party)
3. The Witcher (our polish success and if you read the book before, then you're hundred time more sucked into the game, finding out analogies, which normal player would forget or not even recognize, makes you smile pretty often)
4. KOTOR (both, great plot, especially in first one)
5. Gears of War (though maybe I'm not a shooter fan, this one is really something, blazes new trails, enjoyed it quite much)