Maybe we should have actually winrate published somewhere like you did with Alpha... Also do it at different levels.
First, get a proper rating system, then display winrate of each class in different tiers of the system. This will absolutely shut everyone up about OPs and whining. Ubisoft can also base their adjustment on the data.
I say this because the majority of whiners are bad players and they are more vocal than others. It's unfair for new players to come into the forum and base their outlook on the bias information that gravitate towards the bottom of the barrel on these forums. You really think a top tier player owning you with any class is going to whine about classes? No.
One of the most polar example of low skill public opinion versus truth is Orochi and noob-stomping. Orochi has no unique offensive options and is one of the weakest class against a top opponent. Imagine a perfect defense Warlord (who parties and blocks and doesn't attack unless it's a counter), an Orochi cannot win.