What influences how you rate anime?

When it comes to us avid anime watchers/manga readers, most, if not all of us, are part of some sort of anime/manga community such as MyAnimeList, ANN, AniDB and so on. And each of these anime communities have top anime lists that are compiled by the people of each community. But what causes the people of each community to give a certain rating to each anime they watch? Is it personal preferences? Is it story? Is it the characters? Or is it something outside all of this? Well, lets get balls deep into this and see what really goes into ratings and rankings of the anime and manga we enjoy (or despise) everyday.

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