I know you didn't mean that I am purist my friend! 
I just stated out that I am not one and am more openmided over all but still Icare a lot ofr the lore
Actually, apart from the infamous Love Triangle, Tauriel is indeed, I think, a very lore accurate character
But, as in many other passages of the LOTR and the Hobbit trilogy, the references to the lore are very deep and kind of 'cryptic'.
Tauriel is an Elf of Mirkwood, she serves loyally her Realm and, as an immortal being, she has lived in Middle Earth for more than a century.
She is not satisfied, though, with her life, she doesn't always share and support Thranduil's orders and dispositions, and she is really amazed by all the Magic of the free but dangerous Middle Earth, deeply wishing to leave sometimes the closed borders of her Realm.
These traits of her character are fundamental
The Wood Elves of Mirkwood are, as Tolkien says, less wise and more dangerous, definitely the most rustic and less-developed Elven People in Middle Earth, still conserving their 'ethereal' aura of Elves.
The Kingdom of Mirkwood, by the time of the Hobbit, had already started a policy of almost complete Isolation from the rest of Middle Earth for more than a Millennium, closing the ties even to Lothlórien.
That's why, after more than 1000 years, the Wood Elves of Mirkwood barely knew anything about the other realms of the World, and most importantly of Lothlórien itself; the magical Golden Wood had already become for them a mysterious and mystical place, and the source of that incredible Magic, Galadriel, an element of their legends
Legolas, in the books, refers clearly to these facts, when he enters, full of Wonder, the borders of Lothlórien with the Fellowship
That's why Tauriel is constantly attracted and loves all the incredible elements and parts of the wide and mysterious World in which she lives, hoping to break from the isolation of her Realm, imposed by Thranduil.
Ok, I recognise they may be too deep and cryptic references to detect, but that's how, I think, everything is connected
Tauriel is indeed a beautiful character.
Every form of criticism is obviously and always legitimate (and her role has many flaws), but, maybe, instead of immediately bashing her always and everywhere, someone might try to reflect a bit more intensively about the connection between her and Middle Earth (even if she is a completely fictional character of the Hobbit trilogy)
