I used to be a lot more like that; wanting to complete a game 100%. Now I tend to have less patience, once the narrative is revealed. I think FF7 was the last game I completed every possible aspect of. I guess perhaps I had more time, less money and no girlfriend. As time become a commodity you have to trade with a partner, your attention to gaming minutiae becomes lessened.
There are too many endings to count and u can waste a lot of time just getting them all.
Games like Mario Kart I still pick up today and have a big session, trying to knock down those times, shave a corner here. Even the multiplayer is not too behind the times to play. Multi player Halo/Goldeneye being slightly more engaging nowadays, but not by much.