I agree about the lineup skewing very EDM, but ultimately, it's all a matter of preference. I’ve even said I’m not big on the lineup either. You’re still talking subjectively, which is OK!
Objectively...
Most artists booked for Mardi Gras, including many past favorites, were not at their commercial peak when they performed. That doesn’t suddenly make them weak bookings. There are exceptions, however. In FOB's case, it was because Stump was helping with the Hulk soundtrack. More recently, they had Marshmello perform.
With that said, Bebe Rexha being labeled “not a big/good get” just isn’t backed up by the data. She is a Top 200 global Spotify artist across all genres and has multiple billion-stream songs, with her most recent in 2023.
None of this is claiming she’s the biggest artist Mardi Gras has ever had. They’ve booked larger acts. But at the scale of a theme park concert, she absolutely qualifies as a headlining act.
Disliking the lineup is fine, but presenting that preference as an objective assessment doesn't work.
(As an aside and as a fellow FOB fan - their peak was 2005–2008 with From Under the Cork Tree and Infinity on High. They had a strong comeback in 2013 with Save Rock and Roll, but 2016 was not their height, but ultimately, that's irrelevant to the point.)
Thank you for coming to my TED Talk.