I wasnt even talking specifically about u just everyone in general but BGs dont showcase how good you are at you class since u get disguised in a mass of people , in 1v1 duels there is rng / class matchup / skill
That is actually the only environment you can tell anybody is playing their class right. Sorry to burst the bubble.
You can distinguish a good player in this "mass" of people fairly easily.
WoW has never been based around a straight up 1v1 scenario.
but im 100% sure that any class ( some more than others ) can win here
Call me out if I'm gonna be wrong but the winner of such a tournament is based around 3 classes.
-Lock, Mage, Rogue
As a warrior there isn't even a point in signing up for this, unless you let them Prepot all Protection Pots, allow every nitty item in the game and then let them FAP/LAP to their hearts extent.
(Even then you can't really lose as a mage)
Everything will be determined by matchups, if you want to give a tournament relevance. 3v3 is the way to go.