Worst: my textbooks
Best: anything by Shakespeare
Best: Introduction to Logic by I.M. Copi
Worst: Statistical Methods for Social Sciences by Alan Agresti (which is pretty good for Statistics book but not as good as others I have enjoyed.)
The best, were by Mark Twain. The worst were titles by authors I'd never heard of but my 200 year old 8th grade English teacher liked them when she was young. In college, anything by John Milton was a challenge to get through.
The best: The Chrysalids, and anything to do with chemistry
The worst: Death of a salesman, To Kill A Mockingbird and anything Shakespeare
I loved pretty much all of them, but a tale of two cities was really great