Eh, semantics. To be clear here, I'm not defending the "Rocco is an idiot," posts.
It goes without saying that we're not privy to the same type/amount of data. Which is precisely why I view appealing to authority as equally exasperating as these terrible Rocco takes. It's not an actual argument anywhere, but it's particularly stifling on a fan forum.
If you want to tell me Rocco is great, or he sucks, because X, Y, Z; great. I'm not asking for anyone to derive their own metrics by which to gauge the guy. Fangraphs interviews, league reputation, player productivity, wins, ect; It doesn't matter, use what you'd like, but if you're arguing for or against and spamming "he knows more than you," as some kind of trump card then I'll point to what I said earlier, move along. There's no discussion if we're validating an appeal to authority.