Erza has absolute irrelevance in regard to the dragon slayers. Her character would've been fine on its own by being the guild's leader after Makarov (hopefully) passed away for good.
Well Kaguya was irrelevant, period. She was just added in because Apparantly Madara was "too cool" to get offed by the main characters
so no I don't think it is worse than Naruto's kitten.
Look at it like this. Erza is a relevant character, REGARDLESS of this back story. Sure, it doesn't excuse the a-pulls regarding to her nor justify them, plus I can see she is not well liked in some circles, but at least this doesn't change Erza much. So far at least. If she GOT dragon slayer powers all of a sudden, that would be idiotic. as long as there is nothing dragonic about her or ever will be, it's not that bad truth be told.
Edited by Phantom_999, 15 December 2016 - 07:17 PM.