This does get better, I promise, but it's hard to recommend it until well into the season. Season 2 is great, but it takes half of season 1 to really pick up at all. If you think you can tough it out for a while and it looks interesting to you then it might be worth it during some between-season downtime. Otherwise, maybe just watch something else. Did anyone else either give up on it or power through it and think it was worth finishing?
Radiant was sick, I agree that it's a slow starter but really it gets better with every episode, especially on season two. What sets it apart from other shows like it is the world, I can't really recall any anime taking place among floating islands except Shuumatsu Nani Shitemasu ka Isogashii desu ka Sukutte Moratte Ii desu ka and maybe some other flight/pilot related anime but I cant remember if there were floating islands involved, maybe last exile? Anyways, the world is interesting the animation is pretty slick and while the story might be a bit generic the execution is p good.