Before I watched the TV show, I hated wizards/witches/etc. I hated fantasy as a whole. I found it boring and uneventful.
However, I watched the TV show and was hooked. A comment on youtube said there were books, so I had to read them. I went through them sooo fast!
Since then I have tried reading other science fiction wizard/witch books - and it just isn't the same. Dresden Files IMO is the only series of its kind that makes me addicted as hell.