Superb! A worthy successor to the GTA franchise.
Some of my favorite features / moments:
- earning the Hydra (harrier) and zooming around all the cities at jet speed
- BASE jumping
- flying planes between buildings and under obstacles
- pulling stunts with the NRG bike in an environment providing limitless opportunity
- User Track radio station!
- Customizing vehicles (though I wish they had more options)
- Revenue generating properties
- Brilliant voice acting
- Hillarious radio stations.
This game loses the 1 point out of 10 for missing the one critical element missing from ALL GTA games: the ability to replay missions. There are some tasks that are so fun you'll actually hesitate before saving the game.