GTA IV changed in a good way. Read here to know why...
The game is like any other Grand Theft Auto, you start out small and get your name heard in the city, and soon, you will become heard of throughout the entire city. The story is the same in a way.
But what really changed is the gameplay. Now, you can call other people instead of waiting for one. I'm really amazed on how they got the phone thing to work. You can call people to have dates, night outs, jobs, and requests. You can get calls from other people and choose to either answer or hang up. You can even send and recieve text messages, take pictures, and recieve pictures. You can go into Multiplayer mode with that phone, or get cheats through it. Pretty much the entire game revolves around that phone.
As I have said, Multiplayer was added, and they added more than 10 game modes! There's Deathmatch, Race, Cops and Robbers and much more, and most likely more will come since it will have content download.
The only thing I'm a little disapointed about is the new driving system. They made it more realistic which is kind of okay, but the original driving system was the thing that kept me going around San Andreas.
GTA IV is an awsome game, and because of it's accomplishments, it deserves a 10/10. Good job Rockstar!