Statement: The main problem of Rescue Sasuke subplot isn't because of Sasuke but rather, Naruto and Sakura's character.
Agree or disagree?
Agree. I was going to disagree, but I realized all my problems stem from everyone else's reaction to what he does. That Sasuke took control of the plot was a consequence of Naruto's character finishing its journey long before the series ended.
The character shield? Really an issue of everyone else's reaction to him. He behaves fairly rationally (with one exception) given his motivations.
The main negative related directly to him is his formation of Taka. It makes no sense given his motivation at the time.
Statement: If Boruto, concept and all, wasn't taking after the popular hit series Naruto, whether Naruto don't exist or Boruto is completely original, it wouldn't have the same amount of attention and heavily challenged with its art and background.
Agree or disagree?
Hard to say because the plot would probably be very different it weren't depending so much on the original series. Naruto the series is a giant millstone around the series because Naruto was supposed to bring World Peace, so Boruto is really limited if it wants to avoid stomping on Naruto's accomplishments and characters (though its done that already). With so many issues resolved in the series, Boruto wasn't given a lot of places to go.