Microwaves don't allow for the yeast to activate properly. You would end up with a doughy mass.
Yes, you can cook meat in a microwave, but you will have to use items like marinating and sauces to color the steak as most microwaves do not brown meat.
I recently bought a griller for microwaves. It has a surface to brown meat, though it still doesn't look like meat cooked by other means. It does allow for the meat to be a little more tender. I still use sauces to make the meat look better. I actually prefer the other methods for cooking meat, but when I'm in a hurry it is convenient.