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Take a look at this Minecraft question on Arqade.
Is this question appropriate? As it's asking for opinions about a spawner, and not about some specific questions, I don't think it meets the standards of Arqade. Any opinions?
This question is not asking for opinions. It's asking for a specific thing i.e. the most efficient Zombie Pigman farm.
Therefore it's totally acceptable, and I'm not sure why you feel otherwise.