The 4th preseason game is pretty boring. None of the good players play much (if at all) as no one wants them to get hurt. It is basically a final tryout time for those players who are trying to stay on the team. Teams have to cut to 53 players before the first game (I think), and many teams still have 70 or more players. So you can imagine how they are fighting for their roster spots!
So the final preseason games are more for the coaches than us spectators. Don't feel obligated to watch.
I'm not. That's for sure.