I watched until the second season. I watched the first ep of 3rd season and decided I can't anymore.

I was a bit too harsh in my comment. It's not that shitty. It has incredible animation, for instance.

But other than that, I found nothing likable about the series. It has a thin plot which makes excuses for characters to fight each other. There is no really good message or anything. It's just endless fighting. I understand it's supposed to be action oriented. But it basically has nothing that makes it worth watching except the action. I watched it only cuz it's super popular.