Are we boring?
Obviously I don't think so or I'd be fairly unhappy with my choice of class. But when you see certain statements like this one from Ghostcrawler, you do start to wonder. One of the difficulties I had in writing a wishlist for the class in the future was that our toolkit is fairly limited. We don't channel any weird energies like nature or divine magic or chi, we just get angry and use that anger to smash things, yell at things, and then there's the 'pinball in a washing machine' and 'here is my flag' aspects of the class.
Aesthetically, I enjoy the warrior class quite a bit. But that aesthetic comes in the form of plate armor and is hardly unique to the class - death knights and paladins can wear almost all of the same gear as we can, especially now that transmogrification exists. The fact is, as much as I hate to admit it, Ghostcrawler is right and warriors don't look all that interesting when we attack.
The question becomes, why does that matter? And the answer is, it matters for the overall health of the class and its representation.