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A /fic/ reviewer once went to review episodes on S3 /pony/ as they aired. The threads have certainly 404'd by now, but it was pretty cool while it lasted. We could of course try to do it again, but reviewing is hard work, requiring actual thought and care.
There's a reason people default to "I liked this, but that sucked."
However, imposing strictures against vapid discussion isn't going to make people any more excited about discussing the show in greater depth. It's a mental and cultural barrier that can only be overcome by mental and cultural means.