How many times have you been influenced by a fandom to watch/read/participate in something?
More times than not I have found myself swept up in the roar of a fan base's excitement to get into something new. But there are those instances when the fan content turns out to be more exciting than the actual product.
SNK (Attack on Titan) is a prime example I this. The fandom went nuts, exploding the show into something more elaborate and graceful than it really was.
Homestuck is one where the content is, on average, better than the fan base behaves.
But it isn't necessarily a bad thing for a fandom to be more enjoyable than the content. They can produce amazing art, well written fan fictions/alternate main story arches, a great community, and creative merchandise.
[spoiler]I met a blogger who wrote the most beautiful Noble Six/Halo: Reach fanfiction. She was as good, if not better, than some of the previous authors of the Halo novel series. [/spoiler]
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I spend more time enjoying the MLP fandom's porn than I do watching the actual show.