one of the games I enjoyed most...
It is really hard to put enphasis on some aspect in particular, because the whole game is just awesome.
you have a possibility of free roam, but at the same time, GTA has an intrinsic & well thought screenplay, that gently guides you through the game, leaving a possibility to do other things when you wish...
I features i liked most:
1. Almost everything is interactive: vehicle, people, stuff on the street...
2. Behavior of the people: really enjoable part is shoot in a crowd causing a panic.. hehehehe I really like it
3. Huge amount of stuff to use: vehicles, boats, even heicopters...
The helicopter deserves some words apart: the controls may seem complicarted at first, but after few crashes, you realize that they give you very precise control over the chopper, allowing complex maneuvers. Finishing the game I became a skiful chopper pilot. I used helicopter for some missions & for crimes, while in free roam. Even picked up damn girlfriend to take her to the dinner.
Weapons, from silly pistols to AK47, so you can engage a great street combat with police...
4. Interactin with people makes this game just amazing.. Niko`s girlfriend, whores, fellas... awesome
I dedicated to this game about 2 weeks, playng several hours a day. And I´m going to repeat it again.