Yeah, I get it all. Sadly, it’s still the same shobby game design: ‘rock-paper-scissors’, ‘hate cards’ and ‘meta cycles’ — as old as the game itself, only with particulars relevant to the current format.
Once again, people have tried this for as long as the game has existed, so it’s not new. What might be new now is all those advances in AI, making the alleged rigged matchmaking technically possible, so there might be, at least in theory, a risk of being ‘counter-picked’ by the algorithm all the time if the system deems you too smart and not deserving. 
Sometimes a matter of seconds, sometimes a few minutes — that’s on EU server, different times of the day, from D5 upward in ranks.
You’ve gotta remember that the player base for this format is probably much smaller than anything else — (relative) random errors might be just too big, thus what you observe here.
Like what, by the way? AoEs like Ravaging Ghouls, Dragonmaw Scorchers and Warpaths don’t really clear some annoying boards that well (haven’t tried that weapon, though), so is it all about the taunt package?
Priest, on the other hand, has some excellent tools against it, but is worse against some more proactive decks.
Yep, indeed, as I said above (in the linked post), too — although the list I was playing, when I still did with the Dragon Warrior, wasn’t very optimised… I didn’t use the taunt package, for example, which seems to perform well.
By the way, that’s why, among other reasons, I’ve been playing Paladin or Priest since a certain point instead — don’t like such stupid dilemmas.