GTA VC and GTA SA are the only two games ( in the series ) I'm most addicted to since release. During the release, I used to literally throw all my free time on playing. As soon as school ends, I would rush home so that I can continue from where I left. I totally lost interest in all other stuff, be it studies, food or even playing outside with friends. I was just too damn in love with this game, but soon I was facing way too many irregularities affecting my studies, I had to put an end from playing for almost upto 2012 .. lol.
Since then, I started to play again for a taste of video gaming you won't enjoy it more than GTA SA. I think that's what makes me keep coming back, big or small, boring or fun, or just anything worth for some good old fun alone, the interest has always been there to try it one more time. I carried away by the enjoyment and crazy silly fun of venturing out with CJ on a dynamic open world; things are not limited and you got an upper hand on the ability to freely choose whatever sh*t you like to do. There's a ton to do!!
I never got bored of playing the storyline whenever I begin afresh to choose my ways of taking CJ to the top, make new encounters while I complete every mission and also side stuff that I'm interested to either try or simply skip it.
Seriously, the way GTA SA gives a map you want to go deep into, what order you take it, and how much you want to repeat; any fan of non-linear open world won't be let down a bit.
Of course, there are boring sections too, but almost every game ends up being one afterwards anyways.
But, when it comes to GTA SA ( incl GTA VC ), the idea of complete fun with simplicity and general enjoyment easily made it the greatest game for me.
Had this game received few more polished and patching/fixing, It would become more easy than to trouble myself going through few annoying aspects of this game.
In the end, its one of the best game, I loved playing it and still manage to enjoy it without getting bored