
I just made this in paint.
Kishi Is not bad with romaces. He was being modest. The way the romance in Naruto is built is that every main character (Naruto, Sakura and Sasuke) has a side character who loves them. Naruto has Hinata, Sakura has Lee and Sasuke has Karin, Ino and every other girl in class. But mainly Karin. Every one of these "side lovers" has done something important for the main character. Lee saved sakura`s life, Karin was Sasuke`s medic, and Hinata... well she tried to save his life. The whole romance system is very delicate. And in my opinion it works great the way it is.
If you feel you can do a better job at writting NS go ahead. But the Its my Enemies routine sucks. It always has sucked. Naruto has far to much trust in Sakura and her abilities to just brush her off becasue it may be dangerous. They are freaking ninjas.
Well, I suppose so. I think the problem could come from ambiguous development, like if the development meant for romance or just friendship. Case in point, 615. I think it's quickly assumed that 615 is a possible romance because it's the girl who loves him. If it's another girl, aside Sakura, then it's auto-friendship development. That's the problem. I'm not saying we are wrong just yet, I'm saying don't quickly draw the conclusion without looking in-depth.
To summarize, if it's clear on his intention such as knowing the ending, then I think we can finally draw conclusion whether the romance is good or not.