But this isn't true. What other game allows you to do the things you can do in Watch Dogs?
Other games have mugging. Other games allow you to receive sidequests. Other games have collectibles.
Hacking streetlights has pretty much no bearing on gameplay. It doesn't need to be there. It's been possible to escape the cops in other games without this mechanic. It's possible to do it in this game without using the mechanic because the AI is pretty dreadful.
Exploding things while driving similarly doesn't serve much purpose besides it being something that is possible to do. You can hack gates and drawbridges, but again that's mostly in service of escaping the cops. All this stuff to spice up escaping the cops when you're still just escaping the cops. It's all the same in the end - you're just trying to escape the tedium so you can get back to the game.
And then there's the stealth sections that involve hacking. These sequences are puzzly like stealth sequences are in other games, though obviously they're quicker and less tedious since there's less risk.
My point is that, no matter how much hacking shit they shoved in there, it's still just a standard open world crime world. That's what they wanted to make first and the hacking came second. So no matter how you interact with the world through this hacking, it's still just in service of a game we've seen before.