Sakura is overrated because she overrates herself (example: her planning to 'kill' Sasuke herself, with a poisoned kunai) - it's an inherent character flaw of her's.
She's often seen herself as superior due to her intelligence, which... is fine, it's quite Hermione-like and therefore admirable and occasionally useful, but she lacks creativity and an ability to see outside the box more often than not.
That and she’s not the most intelligent (like Hermione) - she’s often surpassed by Kakashi, who himself occasionally surpasses the likes of Shikamaru.
Those who believe she’s underestimated - by in large due to her new emerging powers - I imagine that was done at the direction of Tsunade, to conceal her true strength… or her emerging strength (because it wasn’t ready, why reveal it?) because that’s what a true shinobi would do… so being underestimated in that respect is actually a good thing.
I always knew she was capable of more - if not for the fact she was part of Team 7 and it was somewhat necessary to have her achieve her dream of them (Sasuke & Naruto) watching her fight and protect them too.
… all the more fitting for her to get that, as Hinata got hers (to fight alongside Naruto).
In a way, as there’s balance in growth and progression between Sasuke and Naruto - there’s a balance between Sakura and Hinata. Keeps the triangle alive - which if Final Fantasy VII has proven, is a huge drive for fans.
Personally - I’m predisposed towards Naruhina for canon. In Fanfiction I have a thing for Sasuhina - so my feelings toward Sakura in general fluctuate.
I don’t hate Sakura - but she’s not my favourite character. But I do like her flaws - if she were perfect, if she was all redeeming features, all-powerful and amazing from the off or even just generally in Part II I think I (& others) would only despise her all the more for it.
All in all, I like this progression in her strength. It’s fitting that she at least equals Tsunade - and like Naruto, will surpass her Sannin master in some way.
But no - she’s not a Uchiha or a Uzumaki. She doesn’t have a Jinchuriki or EMS so if she falls short of the boys because of that - I won’t grudge her for it. And if she doesn’t fall short… well then, I’d blame Kishi for that oversight.
Powerful she might be now, but at this point in time I don’t think it would be realistic for her to equal Sasuke or Naruto… but I like that she can at least keep up, be useful and not cry now.