I am just curious, what makes you say it has aged poorly in terms of gameplay? I would argue it holds up pretty well, but I am also a PC/KB+M only player. I strongly dislike UI/UX that has been compromised (from my perspective) for consoles/controllers.
Agreed regarding the sequels (haven't played the fourth one, just the 2nd and 3rd sequel); they are OK, but not that special.
Even trawling through new Steam releases, you almost always have more reviews for RPG type games (even indie ones).