George R.R. Martin, the creator of the 'Game of Thrones' universe, has expressed dissatisfaction with HBO's 'House of the Dragon.' On his blog, Martin hinted that he will soon elaborate on 'everything that’s gone wrong' with the show. Specific critiques are not yet disclosed, but Martin has previously noted deviations from his source material, such as the handling of the Blood & Cheese storyline. Fans have also criticized the show's pacing and filler content. Despite his role as a co-creator and executive producer, Martin's involvement in plot decisions is unclear. The series, which has finished its second season, is planned to run for four seasons.