Poor Character Development
At times it felt as though a child wrote the first episode of House of the Dragon. HBO poured millions of dollars into the episode because of the effects and the costumes. But the dialogue left a lot to be desired and the character development was poor.
Daemon Targaryen will be one of the most important characters but his development was bleak. He went from brutally decapitating a criminal to ridiculously competing in a tourney. Time will tell if the character development improves but many critics despaired (via Mic).