I guess it has to do with the fact that Rockstar has close ties with UK/Euro publications. If you look at it no mag, besides Game Informer I think has ever gotten any new or exclusive GTA info or images. They always get the same old info and screen that UK magazines have had for months.
I'm currently playing GTA3 as well, and I don't know if it's my memory failing me but I don't recall ever playing through any of the El Burro missions cause the "Turismo" race always pissed me off back when I got the game.
Also I don't know if it's just me but I love cruising around listening to all the made up music the game has, especially the techo and rap tunes from MSX, Rise and Game, maybe even a bit more than the licensed music from Vice City. Not to say that I didn't love the 80's soundtrack or don't hope that San Andreas has a lot of licensed music, but GTAIII's soundtrack was pretty good.