This is end of era state of game right now, people just don't really give a hell.
I think this is an important point which skews people's judgement to make people think secret pally isn't as good as it really is.
The deck is just horribly unfun to play. I think most good people would rather play zoo-lock or something else which is also tier 1 and also just more fun (dark peddler i'm looking at you). Thus you get these terrible players playing secret pally who make misplays (yes this is actually some consideration with mulligans, secrets vs certain matchups, when to trade, etc.) and make secret pally look worse than it actually is.