Mossberg mostly has one guy to thank for the unique place he occupied in the tech media scene: Steve Jobs. For whatever reason, Jobs decided that Mossberg's take on Apple products really mattered, a lot. Mossberg was Jobs's stand-in for Mr. Everyman, and Jobs seemed to believe that if Mossberg couldn't connect with a product, then it needed to be re-thought.
His status as anointed deliverer of the final verdict on Apple's product line gave Mossberg a massive amount of influence in the tech world all by itself, but added to this was the fact that, as with so many other things, the rest of the tech industry slavishly followed Apple's lead -- at least, the rest of the tech industry's PR departments followed it. For a corporate PR flack, having Jobs's own personal oracle say nice things about your product was the ultimate win. It was the fat Harvard admissions envelope, by which I mean something like, "this achievement, while important, has a way outsized significance to a certain segment of the population who compete for it because they've all decided that getting this particular thing means You Won and have a higher status than all of your peers who haven't gotten it."
Interestingly enough, the passing of Jobs was followed by the passing of the positive Mossberg review as the ultimate prize in the PR world, and Mossberg's departure from the WSJ didn't help.
Am I ripping on Mossberg? Not really, more like I'm ripping corporate PR, but Mossberg certainly cultivated this situation (who wouldn't, though). I will say that it was a source of eternal frustration (and envy) among the rest of the tech punditry that Mossberg's reviews had this bizarre status with the PR departments of the companies we covered, sort of like "Harvard as the agreed upon brass ring that all yuppie parents have decided to compete for" no doubt occasions much eye-rolling at Stanford, Brown, Yale, and everywhere else. Nobody is sad to see that era pass.
As for Mossberg himself, Godspeed, dude. May your amulet never tickle.