While I don't disagree, I kind of feel like it's still too early to tell. It's not like the Jailer is the T1 boss of the expansion. I think the main issue has to do with B's ability to actually storytell anymore. In any particular genre, who wouldn't be interested in going up against the master of the afterlife/hell/etc. Kind of feels like they bit off more than they can chew with the concept in my opinion. The good news is that storytelling can be flexible if you're willing to take risks, and they could "save" it.
Semantics - but wasn't Argus more of a tool or an instrument than an actual villain?