The books (so far, I'm on book 3) are better than the movies, but the movies are really good as well. As for not liking it, it just depends on taste really. For example The Lord of the Rings bores me, I can't even get through the first movie, yet everyone seems to love it.
I didnt think the HP movies ive seen were terrible, they were alright but the huge fanbase it has amazes me.
I loved LOTR though... couldn't get through even half a book but the Movies were excelent.