Parts of the build up worked, but the movie didn't tie together as nicely as it could have. The coding aspect is laughable, difficult for those those who can see behind the Hollywood Technical facade. Back to the Future was more believable with the explanation s provided. I'll take a Flux Capacitor over a guy who can write some C code reconfiguring the universe.
Just because you have some classes called "quantum" doesn't mean you can hack the matrix bro, even with your fancy computer...