I'm positive of one thing... Boruto's biggest flaw isn't actually the pairings, though excuse me when I say I do think they suck. Nah, it's the fact it's trying to, more or less, tell the same tired story Naruto went through while discarding all the characters we grew to like on Naruto's journey. Boruto and company, just by existing, are exponentially more powerful than Naruto, Sasuke, etc. all because, well, they're the "NEW" generation.
I'd like to compare it to the far more successful for the time but now seen as a meh series due to the series now having a "true" successor, Dragon Ball GT. At least with GT, when it decided to continue the Dragon Ball storyline, it knew exactly who everyone was rooting for and focused on. Goku, while definitely portrayed as a completely different character and also plot devised into de-aging and maybe given way too much focus, was still the main character. Compare that to how the story treats the title character of it's predecessor, Naruto. Dude literally takes all the L's imaginable despite being god of the ninjaverse. Oh and Kaguya, who was already a plot device used to defeat Madara, she was the weakest, uhh Ōtsutsuki?
Seriously, we went from ninja's with the ability to basically do magic... to kittening aliens. And the sales are going down? Who'd a thunk it lol