I saw the tv series first (the book came later) and really enjoyed it. I think some of the special effects are dated and ... I'm not sure but, like, when I read the book, the tv characters had already been established in my brain as canonical, so I saw and heard those characters as I read the book. In cases where I've read the book first, sometimes I have my own version of canonical characters in my brain and it can be hard for me to accept those characters if I really loved the book and the on-screen depiction is very different. And the opportunity for a disconnect (and disappointment) between versions just increases when you're dealing with a world that varies (yet is so dependent) on our own.

tl;dr: you might find it disappointing because it doesn't 'match' the world you read, or because of some of the effects. But I absolutely loved the series, both at the time and still now - I watched it again just over the summer.