In GTA IV you cant do alot of things you can so in San Andreas.A couple of examples are piloting a private jet,customizing cars,parachuting,flying cars,driving cars on water,etc.Yes theres alot of cheat codes and now multiplayer for GTA IV,but still wow,could of had more fun features.

And they need a tank in the next DLC / GTA. Dont know how it isnt realistice to not have a tank in the middle of the big apple.

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The lack of features that made San Andreas so awesome is the biggest flaw in GTA IV. It's a bit of a let down. Still a good game though!