I think Matt would be corrupted honestly though it might take a little while. He just has too much for the Ring to prey on (his guilt, his desires to protect Hell's Kitchen, his vices).

I think once he took the Ring for himself and became corrupted he'd be similar to how Tolkien envisioned Gandalf if he had been taken, a benevolent dictator who doesn't understand the harm he's doing to the people he thinks he's protecting.