I think that's rather over-criticizing it. Person of Interest may not be able to match Mr. Robot in technical realism, but it is set in a fantastical universe with a fully functional AI. I wish they were as committed to realistic hacking as Mr. Robot, but it cannot be said that they didn't try. Its hacks were explained enough for a layman, and shown enough for a technical person.

And its story was good, too. I'd recommend it to people just for that.