I'm not sure what you mean, but if you're saying GTA4's multiplayer is better then I have to say two things to you.
1) GTA4 sucks for the PC.
2)Of course Rockstar can whip up a multiplayer easier, they have the source code. MTA has to work their asses off to implement multiplayer for games that were never meant to have multiplayer. Don't you realise that?
About point number 1, if Rockstar changes their retarded anti-piracy crap, their inflexible game settings, and their dependencies on bulk programs. Then I will change my mind on GTA4 for the PC. Otherwise, fuck GTA4, I wish they used their brains when they ported that game.