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While I don't really know if it should be banned, I sort of dislike Aegislash because it seriously reminds me of one of Smogon's CAPmons, in that it was *designed* to be competitively good. Not just really stronk like Mega Milf, Mawile, Lucario, etc. but designed to be a completely defining pokemon that can do tons of things and runs tons of sets.
It sort of annoys me when Gamefreak knows how to make super OP pokemon like Aegislash, and then make cool and unique mons like Dragalge and Delphox but then put them a few moves, an ability or a few stat points shy of being at least decent.