Still the best game ever, and the best version of GTA including IV
I like all the customization of CJ in SA - working out, tattoos, clothes. And modding the cars, even though that was limited.
Also, the side missions were highly enjoyable when you did not feel like going on a mission. I have always like the hidden packages searching, and like that each area has its own group. Or, sometimes, I would just take photos of pedestrians, scenery, or events. It had the right amount of diversions when not taking on a mission.
The first time around it took me over 160 hours, that is taking my time, and having fun. Now I am completing it for the second time but only doing story missions. It has definite replay value.