It's mild joking self-deprecation, that's all. In some cases, I suspect it comes from the same place of insecurity as "this is terrible, don't read it" in summaries, but more softened by the awareness that straight-up insulting your own fic in the summary is a bad move. In some cases, people are just poking fun at themselves and their tastes.
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(Anonymous) 2016-02-12 03:38 pm (UTC)(link)