Simple doesn't have to mean poor quality.

I have a Moulinex 800 W microwave with a turntable. It has a non-linear timer dial so that short times are easy to set. Five minutes on that dial is 180 degrees but from then on an extra five minutes is only 20 degrees up to a total of 30 minutes. The power knob is continuous and spans 270 degrees (but the actual power regulation is a simple on off duty cycle control).

I inherited it from my mother thirty years ago and apart from the internal lamp failing it works perfectly.

Moulinex still make microwave ovens with similarly easy controls.