Microwaves don't have different heat settings.
They are very basic and are more about timing than higher or lower heat.
All they need are 2 buttons, one for Time and one for how many times it buzzes (which is the microwaving)
The heat in a microwave is a standing wave, hence the spinning plate.That's why you can't microwave an ant, because it walks around the hot spots (see QI)
If you're defrosting meat, put it on lower than the defrost setting and be patient, as it's a timing issue.
"Microwaves with lots of buttons are for stupid people" says Bruv.