Glad others felt the same, I thought it was just me.
I wonder whether the darkness was deliberate as to try and "hide the cracks".

I found some of the scenes, the ones with the dragons fighting with the leaders riding them, no better than Jason and the Argonauts made over half a century ago! Flash Gordon (Buster Crabbe) would also give it a run for its money!

The last series with the night dragon taking down the wall was fantastic but they seemed to "over-egg" it this time.

Many fantasy films become dated with time but this episode doesn't need time. It's already dated.