I couldn't disagree more. Items are consumables and still cost AP. You cannot rely on them for every combat, so they are meant to have an impact on the game.
Also why would it even matter in a single player or cooperative campign?
People will not be using campign mode for serious PvP, thats what the arena is for.
Also if items are OP then what do we make of barrels? You can still prestack almost any combat encounter if you like.
Its fine if you want to play the game with heavy limitations to items. Just decide to play the game that way. Just don't try to restrict how everyone else haveto play the game.