I'd like to talk about an aspect that doesn't get enough attention IMO.
This game is an artistic achievement. Consider all the creativity that went into making the locations, how well they are made, how well it all comes together with the stories told in those locations, how you feel the weight of a place's history just by exploring it and perhaps reading the old books you find there, how the mood of a place comes across so perfectly through visuals and sound, and so on. I honestly have never seen any other isometric CRPG with this level of immersion and immersive storytelling, and even third-person 3d games rarely do it that well.
And I think that plays a big part in why people just want to go on playing, why simply being there in this fictional world and looking at things, or speaking with someone about small things, is, at times, enough to make you smile.