Didn't someone modify it so you could play with just a joystick and buttons?
IIRC they did release a patch after a few days that let you reassign keys but the problem is the directionals of the joystick are for directional movement and then you also need a seperate set of directionals for aiming\ facing direction so you can shoot while moving( mouse is used for moving aiming direction with 2 mouse buttons for shooting in the direction between the character and the direction the mouse arrow is away from the character) and then 7 buttons ( Light Attack. Sniper Shot, Dodge\roll, Bomb, Use\interact, Activate Relic 1, Activate Relic 2 ) - which doesn't easily adapt from Mouse\keyboard or game pad to arcade controls and not many arcades would be set up to handle 4 players with dual joysticks and 7 buttons per player !
I played wow with a million different abilities, but I had a mouse & keyboard.
I hate games like this with controllers.
I don't even like the 6 button arcade fighters.
I top out at Neo-Geo.
My kids are 6 & 8 and can play any game with any amount of buttons but when I play with them i get confused even on games with 4 buttons. LOL!