I was first exposed to Popper in my first year in university, in an introductory course to epistemology, and I liked him right away. I've carried Refutability and the Paradox of Tolerance with me ever since.

By the way David Deutsch could be reasonably said to be Popper's biggest fan. If you're interested in Deutsch and Popper you could do worse than picking up "The Beginning of Infinity" to get acquainted with both, it's a great book.