I'm not sure whether the old Sierra adventure games can be classed as RPGs? If so then my fave without a doubt is leisure suit larry 3! If they cannot be classed as RPGs then for me its oblivion (I couldn't get into morrowwind, I didn't like the gfx but oblivion blew me away). I'm hoping that I will eventually feel the same for skyrim but so far it feels far more serious and dark and isn't as comical. Also the map (yes i know about the map mod) is very annoying the oblivion maps although much simpler was far easier to use. For now I'm playing Fallout Vegas again until I get enough motivation to load Skyrim.