Look at what Trace McSorley was able to do with the same offensive line, the same offensive system in the 2nd half of the Tax Slayer Bowl against the #1 Pass Defense in the country that year. Almost led a comeback for the win, drove the team up and down the field, threw touchdown passes. That's as the backup QB with probably 1/10th the reps that Hack was getting. Hack did nothing while he was in the game.
That wasn't a great offensive system, that was a bad offensive line, but the offense was made worse by Hack. If McSorley had started that entire year, we would have probably scored 10 more points per game.
Everyone wanted to point the finger at everything and everyone else but Hack - Franklin, the offensive line, the OC, etc. All weren't good, but Hack was just as bad. And still is. Hell, I read people bashing the Jets here, that's the reason Hack struggled.