[quote=@vancexentan]
Fair enough however if I pick Noble Knights I just want to say it's incredibly easy to get out their King and keep him on the board as it only requires two cards at the least. I once got him out four times in a round against a bujin player.
[/quote]

Again, as long as there's a chance other structure decks can beat it it's fine. Ask yourself "Is this deck able to be beaten by three other structure decks?", and if the answer's yes then you're probably good. I'll be judging each one individually, so if you're unsure I can give advice on how to buff/weaken it.