The Suck Fairy.  Fascinating concept!  Click over to tor.com to read this short blog post about her.

I can see it applying to books, movies, restaurants and ex-lovers!  You loved them and then you look again and…

https://www.tor.com/2010/09/28/the-suck-fairy/

“The Suck Fairy comes in when you come back to a book that you liked when you read it before, and on re-reading—well, it sucks. You can say that you have changed, you can hit your forehead dramatically and ask yourself how you could possibly have missed the suckiness the first time—or you can say that the Suck Fairy has been through while the book was sitting on the shelf and inserted the suck. The longer the book has been on the shelf unread, the more time she’s had to get into it. The advantage of this is exactly the same as the advantage of thinking of one’s once-beloved ex as having been eaten by a zombie, who is now shambling around using the name and body of the former person. It lets one keep one’s original love clear of the later betrayals.”