by airmanwhit
I think you should do whatever you want to make the game fun.House rule the snot out of the game if you want to! You should't have to struggle through the scenarios however; there are tons of resources to help you build decks. If deck building isn't your thing but youi like the game go find some decks build em and play. The beauty of this format (co-op) is that you aren't hurting anything by playing your way. Obviously you would have to conform to a tournament format if you played in anything official. But yeah... tweek to your hearts content.
have fun,
airmanwhit