Well, for some people (like the people bandying about the term Mary Sue), this is the problem. They can pretty much be ignored as the usual misogynistic trolls.
This is a fundamentally different question and one that gets at how the show kind of chafes at people who are fans of the books.
If we stick to the materials the showrunners have the rights to adapt, there isn't a lot to go on. In the LotR appendices, Galadriel and Celeborn live together (not Celeborn lost at war) in Lindon for a time, she's mighty enough to rate one of the three rings (along with Gil-galad and Círdan), and she throws down the walls of Dol Guldor after the One Ring is destroyed (presumably with magic more than force of arms). That's not much to say anything certain.
That said, if we do consider materials they don't have rights to but aren't supposed to contradict, she and Celeborn rule Eregion before Celebrimbor and the other smiths, she heads off to Lorien before Celeborn, and is suspicious of Sauron in his guise of Annatar while Celebrimbor is taken in. And, moreover, she's not a fan of the antics of Fëanor and his sons and their obsessive enmity with Morgoth over the Silmarils. But here she is obsessing over Sauron and seeking revenge for the death of her elder brother, Finrod, in a quest of Fëanorian proportions. And, for me, that irritates a bit. Pretty much every reference to her in the books, she's generally wise and insightful, even if a bit ambitious to rule her own lands - not obsessive and petulant like she is in much of the first season of the show.
So, yeah, I see the complaint about her depiction being a bit hard to swallow. I certainly have a hard time with the idea of her alienating Gil-galad and Elrond to the point where they're trying exile her off to Valinor. That also seems a misuse of the trip to Valinor to me.
And the sad part is I think they could have portrayed her as more mature and wise but still suspicious of the persistence of the enemy's forces and influence. She's suspicious of Annatar for reasons, she moves east to Lorien within much shorter distance of Mordor for reasons. She's definitely got the temperament of a warden, but a generally patient one.