They had the budget, a good script material, a fantastic brand and we end up with a serie B type of series.

The casting director did a terrible job: actors are either bad or simply don't fit at all with their characters. This is the most drastic downgrade versus GOT.

In terms of pace, this is very difficult to follow with years gaps between episode, but despite the crazy fast forward abuse, it is sadly slow and boring. In 6 episodes, very little is happening except the change of actors to incarnate aging characters (change for the worst btw).

Lastly, to create some ambiance, they decided to shoot in dark which makes it very difficult to watch.