I disagree with you, Karst. Whilst there are a lot of scifi tropes and points of irritation in Fallen Angels lore (They're some kind of super-soldier descended Atticus Rockford special snowflake Alliance Battlestar Galactica mfers with very obvious similarities to both Colonial Republic and The Legion of Edgy Names), both the Crayter Republic and the Hellfire Legion have gradually been seamlessly integrated into discovery lore. There's a lot to like about the Angels - for one, they make the Omegas more colourful and diverse. Secondly, they're a natural opponent to the coalition - the Coalition need a paramilitary opponent other than the Corsairs.
Plus, it's actually fun to read Angels lore. They have more pre-existing good lore than damn Vanilla Unioners had before the 2016 revive.
