The main story(apparently) seems to be pretty short and not all that good,but the ton of interesting sidequests/races/minigames make up for it.Driving is described to be similar to the one in Driver - San Francisco(Ubisoft Reflections worked on this aspect of the game so no wonder there).One thing that the majority of people are praising is the profiling of NPCs as there doesn’t seem to be a shortage of interesting/unique characters.
The game is not officially out yet but those who got their hands on the review copies have been sharing their impressions for quite some time now.