The underworld of SW could actually be interesting if they took the kid gloves off and made it violent and gritty, but since they are going the family friendly route, it becomes much less interesting. Stakes too low, and too campy.
It's always been family-friendly. Who wants gritty and violent Rated R-esque Star Wars? That's not even the genre or style it originated in. It's one of those things that may seem dark and violent when read on paper, because the imagination fills in the gaps, but overall on screen it's not. It's barely one step above A-Team status. The Bounty Hunters are ehhhh, and only a handful are interesting when they're embedded in the Republic/Empire/Jedi lore. All of the Jabba & Syndicate stuff is underwhelming on its own. The only SW underworld I actually like is the Cade stuff...and that's only because it's so far removed, it reads more like old school pirate action adventure.