I never said that you need a pre-made to beat a pre-made. I said that a group of good players will perform better against a pre-made. You can get a group of good players in a PUG, but you don't have any control over that. You could just as easily end up with 7 new players who click all their abilities and don't know how to use their interrupt. If you group with good players, you have the control. You are the one deciding how well your team will fare in the next Warzone, instead of leaving it to the lottery of the WZ group finder.
There is nothing unfair about a pre-made playing against a PUG. The pre-made may have the advantage, but it's because they have taken the initiative to organise themselves into a balanced group and improve their skills together. On the other hand, we have you. The solo-queuer who cries because they lose every game, despite being the best PvPer in the world. You know everything about your class and how to play it; you don't need to improve. Communication? Screw that. You're losing every game because the other team is cheating. You're losing every game because the game is broken. It's not your fault. It's everyone else's fault.