I never owned a GTA. I always played it at my friend's house and all we would do is go around, use cheats, and kill/murder as many people/cops and blow up as many cars/helicopters as possible. It was always an hilarious time no matter how sadistic that sounds.
To be fair, I've only played GTA3, so I'm looking forward to the next TRUE installment. It looks.....well.......like a huge upgraded GTA3; and that's ok with me. Honestly, I shouldn't have even mentioned the "dope movie" part, because odds are, I won't be even playing it for the story. Same thing has held true for all the GTA's I've played; especially the original.