Dynamic radio stations. Seriously, The whole "let's use one long sound file to ensure smooth transitions" idea is okay, but gets old when you're forced to hear the same songs in order in each playlists every time you start the game. The order of songs on the radio should either be shuffled, or we should at least be given a glitch to skip songs.
I'm not sure if it was just me, San Andreas had the tracks play randomly with random but same intros. Like the thick fog bit by Julio G before Guerillas in tha mist at one part, then some other bit before it, eventually before redoing the thick fog thing again.
My last sig was to someone who thought they could do no wrong.