I agree about negative reviews... why waste time and energy on them? Some people think they give a reviewer credibility, but I don't agree. Great measurements and weighty technical comments give a reviewer credibility. A great review teaches me something new.
IMO, AH's most useful reviews are the subwoofer reviews by Josh Ricci, who does almost everything on the most wanted list. In fact, I think his reviews are equal to the best reviews on any audio equipment I've read anywhere.
AH's electronics reviews are pretty good, but often the subjective portions are not very useful. More comments on fit and finish and component choices would be welcome.
More blunt feedback:
Reviews without measurements aren't very useful, like the one for the Legacy Focus. I remember a few of us asking the equivalent of "Where's the beef?"
Most of AH's previews aren't all that useful. You personally wrote a very good one on the latest Revel sub, but that was, unfortunately, mostly an anomaly. A few more like that one and I'll change my tune.
I'd love to have more reviews with full compliment of measurements but it's not always practical. The latest example being Josh's review of the XTZ sub which is taking almost 6 months to come to fruition. Most peeps writing for us have other jobs and commitments and it takes time to do measurements properly.
In addition, we are in quite possibly the most fickle industry there is. I simply cannot generate enough ad revenue to support hiring multiple qualified reviewers full time and still make a living myself. I also can't collect enough revenues from consumers as they are typically equally fickle and expect everything for free.
Most manufacturers don't place a lot of importance to online magazines. The audio industry is still about 20 years behind the time in marketing and are under the false impression that a fullpage ad in a print magazine that has miniscule circulation will some how magically produce results (of course the results are never tracked). So it's a catch 22.
Also most readers don't really care if a review has measurements and even more don't really understand the measurements anyways.
I disagree that a review without measurements has no use. You are still getting practical experience from a reviewer that has evaluated 10s or 100s of products prior.
As for previews, they are our answer to the rest of the industry's so called reviews. They get great SEO, especially the comparison previews. They often get more traffic than formal reviews and they are quick and easy to write. In order to maintain a constant flow of new content to the site they are a great necessity and they won't be going away anytime soon. Per request of others, I have separated the preview and review content with the new site template for those that care to filter it.