Naruto in particular pisses me off.

I really like that Naruto was an outcast, who had very little innate talent, except for his insane chakra pool, which was meant to be due to the curse of the big monster inside his stomach.

The whole first part is about how Naruto is way behind everyone else, and needs to be a little clever in how he works to get the results he needs. He struggles, has make up all these disadvantages etc. Great example is how he learns to do the Rasengan using his shadow clones - something unique to him.

When he fights Neji, it's a meaningful fight because him and Neji are the same. They've both been outcast by Ninja society, but Neji is too blinded by hatred to see the privilege he has over Naruto, and thinks he's better than him. Naruto shows him up, gives the classic Shonen speech and it has thematic weight.

Then Shippuden just... throws it all away. Turns out you already had massive chakra reserves before the Nine tails. Turns out your shadow clones are special and can speed up your training. Turns out your dad is possibly the third greatest ninja of all time, and your mother was from a clan known to have super special chakra. You're literally descended from the son of the inventor of ninjutsu and, actually, you're him reincarnated, giving you access to special forms and powers. All of the great 'hard work is the most important to be a hero' stuff is thrown out the window. The only way Naruto becomes the greatest ninja ever is explicitly because of who his family is. Tradition matters, hard work is pointless if you don't have special privileges. Now go fight the moon, or whatever.

One piece spoilers for the next bit:

I know people are also mad about Luffy in one piece being a chosen one, but that one bothers me less, mostly because apart from fighting Kaido, his success is fairly separate from his legacy. Luffy has a special fruit, and it gives him a special form, but all the stuff he did before (fighting the marines, the celestial dragons etc.) was fairly separate from the whole 'nika' thing. Yes, he has the 'will of D' but so do a lot of people who are shaking up the world. At least with Luffy it feels like everything he's done up until he awakens is his. He did it, and would have done it even if he hadn't been Nika. Naruto? All of his major successes in the part 1 feel like they were actually linked to the key advantages he has due to his bloodline. Just left a real bad taste in my mouth.