I wouldn't trust any one review, be it professional or not. Reviews of all types are information. No one believes any scientific paper published until peer review duplicates the results elsewhere. No one should either entirely believe or disbelieve any opinion read anywhere about an audio component or piece of music. But if the first review is validated by the same opinion from other sources, it hold more credibility.
When you get a body of evidence, several professional reviews from the rags, maybe a e-zine review, and some comments on forums, and they are all or mostly positive, I will buy something without an audition. Examples are numerous phono cartridges including Denon DL160, Empire EDR, tons of Grados although they don't really count as I've heard a zillion other Grados before purchase. B&K ST202 amp, PS Audio 4.6 preamp, VPI HW19 and Rega P2 turntables, and about a zillion different cables. However I've yet to buy any speaker before listening to it myself, or a CDP without listening first.