I think the biggest problem is that people used to have this "amazement" toward people with a relic, no matter what it is. Now that Empyrean weapons that surpasses most relics are so accessible, people automatically carry that sentiment over toward their Empyrean weapons also.
SE really did make Empyrean weapons VERY easily accessible and I'm guessing they are going to do the same for the relics also very soon.
I think SE's intention is to make all weapons more accessible than it has been for many years (I wonder what they'll do with mythic weapons..)
Anyways, 99% of the people who hate on Kannagi are trolls who are just looking for attention. Seriously though... Wouldn't it be just easier to troll on SAMs with Masamune?