I've given 5 stars. It's only the first episode. It may improve. As for these 10 star reviews; bit lost as to how.

It's a spin-off on a budget. Which is noticeable, but, understandable.

The storytelling isn't to the standard of the GOT 1st episode. Once again. Understandable.

As for the casting:

Diversity quotas have come in. But! It looks silly. Especially the aesthetic of Lord Velaryon; like sticking a white dude in the Wakanda hordes. And the premise of his character is flimsy. The hair. 😄

As for the casting of Princess Rhaenyra, she's simply not pretty enough & too small to play that roll. I'm no oil painting, but, come on! This is fantasy! Give us the Targaryen beauty. Okay! Emilia Clarke isn't that tall, but, she is stunning.

I started to get bored. IT IS fair to compare it to GOT, because, they have taken on that world.