Microwaves are little use for anything that can't be stirred, because they don't cook evenly. Plated meals: the periphery gets frazzled whilst the middle is still cold. Thawing chicken breasts: spots get cooked whilst the rest is still frozen. Even reheating a curry or a stew, you have to use a Pyrex casserole, because the 'tide line' around the periphery gets superheated to the point where it melts plastic bowls and leaves a tide mark of burnt food embedded in the plastic. Porridge: no good either, you have to keep opening the door every few seconds and stirring it to stop it boiling over.