Here we go again.
Honestly, I don't understand why so many people get upset that Naruto is the most powerful character in the series. He is the main/title character. This really shouldn't be a surprise to anybody. He carried the entire Alliance (Sasuke included) through the most recent war, and yet there are still people that claim that Sasuke is still better than Naruto.
I'm not saying that either character is stronger than the other at this point. Their interaction with So6P and the fact that Naruto has been training/fighting in the war for several days straight essentially guarantees that Naruto and Sasuke are pretty much even going into their final showdown.
As for the Plot Shield crap, how about we list all of the times that BOTH Naruto AND Sasuke benefited from plot:
1. Naruto would have been killed when he was born, and Sasuke would have died in Obito's initial attack on Konoha at the very beginning of the series.
2. Itachi would have also killed Sasuke during the Uchiha massacre.
3. At the Academy, they would have failed their first test with Kakashi without the protection of plot.
4. On their way to the Land of Waves, they would have both been killed by Zabuza or even that shinobi that was hiding in the puddle.
5. Haku would have killed Sasuke and then would have killed Naruto.
6. The Chunin Exams were full of Plot Shields. All three members of Team 7 would have failed if Naruto hadn't yelled out. They would have been killed by Orochimaru in the Forest of Death. The Sound shinobi would have killed them all if Lee hadn't intervened. They would have gotten lost in the Forest of Death if Kabuto hadn't helped. They would have been killed by the Water Clone shinobi. They would have both lost in the next round. Naruto would have lost in the final round, and Sasuke would have been disqualified for being late.
7. Gaara would have killed them both.
The list goes on, and this is still very early in the series. The fact is that nearly every character in the series survived due to the plot at some point or another. In fact, most recently, Obito, Madara, and Kaguya each should have won the war at some point if it weren't for the fact that Kishi didn't let them.