The Kage Summit Arc is one of the worst Arcs ever for Sakura, pre-War Arc and Ending. It was the Arc that Haters would rub on pro Sakura fans faces. It was also the Arc that grew the most Haters. Kishi was addressed about the Summit Arc in JF. Even the JP fans say that Sakura was not acting as a heroine from that Arc, and that lately Hinata was given more of a heroine role.
In the west, excluding majority SNS shippers, majority of Sakura haters wanted Sakura to do one thing; stab Sasuke.
You have a confession that is controversial against pro/antis, her drugging her own teammates, her not stabbing Sasuke just after he attempted to kill her once, bringing Naruto and Kakash into rescuing her, for her to make the final decision that she will now let Naruto and Sasuke deal with each other, stay in the background, when previously she stated how she will fight together with Naruto for Sasuke. She didn't act like a heroine at all from this arc.
If Sakura even gave Sasuke a cut, not actually stab him, it would have at least gave notice to Sakura's growth, that this is no longer the same Sasuke and that she is over her crush and that she is doing this for Naruto.
But she didn't. And worse, she was having flashbacks of her moments with Sasuke part 1, which heavily implies that Sasuke still has a soft spot in her heart. It would have been fine if Sasuke hadn't tried to murder her the first time behind her back.
I agree with antis in that this arc gave no importance to Sakura other than create problems that would have been avoided of dealt with properly. Kishi did not have to plot Sakura drugging her teammates, or write her still being in love with Sasuke.
Agree.