I doubt game designers and creaters would have put items into the game if they saw it as cheap or a way to cheat. Cloak of Mirroring isn't a cheasy item, take this for example. It only deflects offensive spells, not spells like Symbol Stun, or Power Word Silence so there's still a good chance it'll be useless in a wizard battle. Staff of the Magi also isn't that bad. It adds to a mage's AC to help them in heated combat and equipped Invisibility isn't all that great considering most magical creatures like liches and dragons can see through them. You even have to wait through most of the game to gain these items, so see them as well earned rewards instead of
cheese.
Nothing is
cheesy, you will soon learn young grasshopper