The books are perhaps the most engrossing series I've ever read. I'm a huge fan.
Probably my favorite moments in the series so far are (non-spoilery) Ned and Joffrey's encounter towards the end of Game Of Thrones, the battle of King's Landing in Clash of Kings ("Those are brave men. Let's go kill them"), and the Red Wedding in Storm Of Swords (well, duh). Feast For Crows was probably my least favorite, but it was a much-needed break from the frantic action in the first three books. No worries.
However, I'm somewhat skeptical that the series will be finished in Martin's lifetime. Let's see, he's almost (crossed fingers) done with A Dance With Dragons, and has *some* material written on The Winds Of Winter. But there's still the whole last book (A Dream Of Spring), and given that he's been averaging, oh, 5 years of time spent writing each book, well....
The man's 62, so it's not totally out of the question, but the picture of health he is not, sadly.
(Disclaimer: I'm well aware that he has other interests besides writing, and he likes to take his time in crafting a high-quality product. These are all good things. I'm merely saying that I hope he finishes this series that he's clearly already invested so much time and effort into)