As someone who's never actually gotten a character to 50-55, I can't speak for the higher-ranking Warzones. However, I've noticed a lot of people seem to be really stubborn when it comes to PvP. For instance, I just had a match in ACW with a very annoying(and continuing on the theme, stubborn) team leader. I tried to explain a supposedly good strategy to him, but he seemed annoyingly stuck to "2 left, rest mid". While I have no qualms with this strategy, I feel that mine could have won the match.
Since obviously sides are the exact(reversed) opposite in ACW, and teams usually go 2 left, the rest middle. Now since the enemy's left is our right, wouldn't it make much more since to rush the enemy's left(assuming they send two like usual), and hold the sides? As long as you have people calling out incs, it's fine. The 2 times I've actually been able to grab open-minded team mates, we actually won.
tl;dr:
Wouldn't a "2 left, rest right" strategy do fairly well against the conventional strategy that sends the majority of the team towards the middle?