It IS one of the best things on television! I think they have not only done a superb job with casting but also condensing the plot. Most shows that falter in their later seasons didn't have a brilliant writer who had already laid out an extremely complex world.
Plus, Jon Snow is just so f'ing pretty.
The books (the longest thus far is just shy of 1000 pages) are tops and I am also anxiously counting down the days until the ADWD comes out!