My school decided that 6th grade was an appropriate age for us to read My Ántonia. As a result, I've never tried to read Cather as an adult because I hated her so much as a kid.
Now I am rereading it all these years later. Beautifully written, though still not my favorite book ever or anything, but worth reading.
Have you ever gone back and read something you hated in school? What did you think?