Great series. I've read all five books, but I have only watched the first season. I would often hear comments about it being good and one day out of boredom I picked up season one at a store and I got into it.

Tyrion is the best, most entertaining character to me. Although to be fair, all the characters are very well written. If you only watch the show, I think you're missing out just because you get to know what's going on in their heads.