I don't think it is even possible for one human being to have fully heard and auditioned ALL the potential "top" gear out there (let alone all the mediocre gear!), but from having spent quite a bit of time reading pages on his site, I believe he has a wealth of experience, more than most audiophiles and even many (if not most) dealers.
Opinionated? Yes. But who isn't, when it comes to audio, and his opinions are backed by a genuine effort to be objective, according to his own specified criteria, and --as he points out somewhere on his site-- unbiased by any hidden agendas, since he no longer sells gear of any kind. I've never heard nor read of anyone making such an effort to be not only objective, but to explain and qualify his whole approach, openly and clearly. No one is perfect, but overall, I'd give his opinions a lot of respect.
Just like FisherDude, I'd love to spend some time with this guy, listening to tunes and discussing audio. I suspect he's forgotten more than I'll ever know about the subject.
I have one of the LPs on his list of great LPs; not even the top "divinity" list, but one on the list or two below that (IIRC): Laurindo Almeida Virtuoso Guitar (Crystal Clear Records, Limited Edition, Direct to Disc Recording, 45 RPM LP), and if that is anything to go by, the guy knows his stuff. It is one of the best-made recordings I've ever heard, period. I bought it when I saw it, in part because I remembered reading it on Mr. Salvatore's list. I was not disappointed.
If I had the options (i.e., ran across another of his recommendations as I did with that LP) and had the money, I wouldn't hesitate to try another of his recommendations, based only on his opinion. I might disagree with him on a few things in the end, but I doubt by too much.