Supposedly Take Two forced Gearbox to rush the DLC under threat of funding cuts.
I don't think I can list all of the bugs (because the list is 3x longer than the patch notes), the game is essentially unplayable for most people- including Russians who got rug pulled on the day of release by having the entire game region locked without warning. ~~Regional pricing is also marking up the DLC as more expensive than the game itself.~~ Regional pricing was very quickly fixed.
Now the game is getting review bombed and lots of people are just refunding &/or down patching since the game is broken even without buying the DLC.
Kinda bummed about this. Even the original coder for the game came out and admitted they butchered it.
There are third party tools that let you do that, not officially supported though. So yeah you can revert the game to its previous fully functional state at least. Just a shame it doesn't work properly out of the box atm ya know? It's a hassle