It seems the two things that "Consumers" rated poorly that took the overall score down were noise, and ease of use. I found that the noise comes from the fan, as this oven can be vented through the vents in your oven hood if they have external vents, but if not, it recirculates the air and does make a little bit more fan noise than the average, but not enough to be a real problem. As far as "Ease of Use... I have no idea how they could find anything difficult to use on this oven. In fact, it was easier to use than our old oven, which was pretty easy itself! It has the "fast cook" buttons (1-6) that are just one touch controls. In other words, if your meal says cook for three minutes on high, just close the door and hit "3" and you are done cooking. That seems pretty easy to me!
It has a turntable, which is a must in my opinion, and after several months I find it to cook as well as any microwave I have ever used. I installed this microwave by myself in one evening, with minimal difficulty, though I suggest that if you have someone that can help you when it comes to actually lifting it up and hanging it, it will be a lot easier. The only complaint I have is that the door does not have any kind of button or release, so the mechanism used to keep the door shut makes the door a bit loud unless you close it with caution.
It is a great oven and a great buy. Though I can't speak for longevity, it seems well built, and it should last quite a while. I will update this review if anything changes.