I've put a few hours into the game now. It's good, but not great. I had more fun with GTAV.
There's been a bit of looking for certain people with security cameras, which felt like a point and click game to me. I also spent quite a while trying to figure out how to shoot out of cars, that was disappointing.
For good fun, go on a train and start shooting people. Every person sitting down will have the same death animation, unnaturally going into an upright sitting position. Then the police will go after you, but don't worry you can just stay on the train and get away. The police are all like "Oh man he's getting away, if only we had some way of knowing where that train is going."
Lastly, Aiden should audition for the next role as Batman.