It is good but not great.

Although its shortcomings are not coming from the production (except some bad casting choices - Daemon being most egregious) but from the source itself.

Targaryen civil war is not half as interesting as Game of Thrones. And its described on couple of hundreds of pages. I am not sure how they will expand this to 5+ seasons without having similar problems like with last few seasons of Game of Thrones.

And all the fans know how it ended. Dance of the Dragons is well described in companion books.

On the good side, its good production and there are dragons :) So, if you are a Game of Thrones fans its certainly watchable but its not as exciting as Game Of Thrones.