Ignoring the lack of updates if the game is buggy, games back then were also more focused on quality and make gamers replay the game with unlockable features based on skills, not money. I can't count the number of times I played Metal Gear Solid games over and over to unlock new features playing the hardest difficulty and with handicap features, and also to find Easter eggs. Speaking of Easter eggs, you'd lose a number of hours exploring every nook and cranny finding them!
I loved reading through the manual for Morrowind with the copy we got on the original XBox. I read all the class descriptions, details about the schools of magic, and had a whole character planned out before starting the game. I didn't get into tabletop gaming until much later, but looking back, that manual really captured the same feeling of reading through the D&D players handbook and picking out a race, class, background, etc.
I think that feeling is why it's still my favorite PC game.
This was my exact experience. I read the book and looked through the map it came with. Morrowind was the game that caused me to change from FPS and Sports games to RPGs.
Ahh, the maps were so good. I remember using the extremely detailed hand drawn map to help me locate the Cavern of the Incarnate, and other cool locations. I am sad that I didn't keep them.