I really enjoyed it for a couple of weeks, but largely for the graphics and because I know chicago well. Ultimately, it's a bit limited.
The 'hacking' gets old, the police are a joke, the side missions are all the same and they didn't give attention to detail. There are no splashes when you go through puddles and the interior view of the car looks like it's been done in paint.
I also think they made a mistake in not providing a first person mode, which would have put distance between them and GTA.
GTA5 on current gen will blow it out of the water next month.