I've always felt that they were but have kept one in my house because it's so damn convenient..
but a niggling feeling every time I nuke something is...'am i now eating cancer'?
No. Microwaves are in the middle of the electromagnetic spectrum between infrared light and radio/television waves. In this range of the spectrum (relatively long wavelength/low frequency), the oxygen-hydrogen bonds in water absorb this energy, are excited and heat up. Nothing less, nothing more. There are no direct chemical or nuclear changes in the molecular composition of the food.
The abstract of this article gives the impression that mice cells were placed inside the microwave oven. And afterwards were inspected for changes in DNA. I don't think that it is @LacesOut 's intention to put himself/herself inside the microwave oven.There is increasing research to suggest, that even though the above quote might be true, changes are observed on a DNA level.
https://www.ncbi.nlm.nih.gov/pubmed/2304485