Is Khorne supposed to make you angry?
I hate that nothing makes money so settlement upgrades are only good for unit buildings which are the only building type worth building at all so you just constantly run negative and get by abusing sacking and battle money. There's no reason for them settlements at all, just make them a horde faction with moving bases.
You fight a lot and the units are cool for a while but every battle is the same and you cannot make any other type of army than the Khornemanii you start with, it's always just smashing into the enemy and you win or you lose.

Greenskins are memed as the ultimate pile of violence faction but they have a deep roster that allows for a lot of theming and messing around with all sorts of strats even if they can often win with the same strats but Khorne just has nothing. I can't really put my finger on it but I played Skarbrand and the Bloodthirster in Lustria before the DLC and I remember having more fun with both than I'm having with Arbaal now, I wonder what changed.