Bill Wright has brought this to us :
I don't find much use for the 1,200W setting. The only real use is for
heating water quickly when the kettle's broken. Even jacket spuds are cooked
unevenly. Thick soup needs to be stirred during cooking. Meat is hopeless.

I never cook meat in the micro, it is horrible. I do sometimes reheat
it. With all things apart from liquid, or with a high liquid content, I
stop and stir often. Spuds I rotate, to try to even out the cooking.