1. More gore
2. Custom soundtracks
3 Better wanted system, (can't even push/shove somebody without police on you're ass)
4 Car Customization
5. More cars, clothes and weapons
6 GET RID OF THE FUCKING CELLPHONE......
....
I mean really, did anyone else get so annoyed using the damn cellphone in GTA4? Everytime I do a mission or anything for that matter I would get a call or text right in the middle of something and it gets so annoying.