The only reason Sharp isn't listed here is because they fail so radically by computer failure, catching on fire, etc. etc. that no-one has the piece of crap things fixed due to the cost of getting "hopefully" one more year out of a dead dog.
They ALWAYS fail shortly after warranty.
Look what they say about it.
The graph shows the percentage of the following brands of over-the- range (OTR) microwave ovens bought between 2003 through 2007 that have ever been repaired or had a serious problem. Differences of less than3 points are not meaningful. KitchenAid has been the most-repair prone brand. While we lacked enough data for all years to include Sharp in the chart, we have sufficient data to conclude that it has been a repair-prone brand. Models within a brand may vary, and changes in design or manufacture may affect reliability. Still, choosing a brand with a good repair history can improve your odds of getting a reliable model.