GTA SA was the weakest in my opinion the story line was good in the beginning with all hood gangester stuff then goes off other crap.
Vice City from beginning to end had a much better storyline and deeper characters. GTA4 is also great but I only characters I like were Niko,Pakie,Roman,Manny,Brucie. While vice city I liked Tommy,Ken,Radio talk host etc..
GTA3 was just revolutionary for its time and its still a great game.
I hate reruns!! Its good that they make something new in each one. Vice city = no swimming, in a place NOT in NY San Andreas = swimming avalable, dating avalable, 2 player mode, fat and muscle options, gangsta starting story mode, CASINOS GTA3 = mob work (then again, which 1 isn't at some point?) GTA4 = Internet connection