CR is not geared towards experts in any field. If you are an expert, then you don't need CR for that range of products. CR is oriented towards best-bang-for-your-buck with a reasonable price limit. So for example, floorstanding speakers get you more bass extension but compared to a subwoofer plus satellites, the marginal increase in audio performance is not a good value. You get 80-90% of the maximum possible quality by spending a few hundred dollars. After that, the increases in performance have a much higher dollar/quality ratio. CR doesn't care about those lofty levels. Same thing with most of the other items they review, yeah there may be a $10K vacuum cleaner out there that vacuphiles dream about in their sleep, but for most people the $100-$200 range is going to get them 80-90% of the cleaning performance for a whole lot cheaper. That's why a honda will beat a bmw and an apex dvd player will beat a madrigal dvd player in their evaluations. CR is about maximizing the bang/buck ratio and that's their bottom line. Plus they don't take any money or products or anything else from the manufacturers that they review, they do it all themselves and thus are the only commercially-unbiased source of reviews.
Places like Amazon and audioreview, etc suffer from a number of problems - ringers are the easiest one to pick out, but then there are also the people who having made a purchase are now psychologically commited to believing that it was the best choice possible and they validate that choice by expressing their belief online. Its all relative, but CR is the closest thing available to an unbiased, scientific evaluation of consumer products.