I don't know, maybe there's some confusion here, so I'm going to clear things up..
I personally believe Bang is S tier and a good couple steps above most of the cast. I think he's quite easy to play, and I completely support the list saying no bad matchups and many 6-4 and 6.5-3.5 . I have personally experienced this. Bang is crazy. His 5A is unreasonable. His air-grab nonsense is unbelievable, but hey, at least other people's air grabs are worse (Ara 100% fever, Litchi 4.5k+ nonmeter corner oki).
His pressure is so good autopilot that when you actually do add intelligent decisions to it it becomes damn near unstoppable, especially if you punish bursts. There are too many ways to mix people up safely, and his Dnails are fucking stupid.
All that said, I love the character, and I'm not sorry he's this good. Suffering through CT's imbalanced top tier was bad, it's Bang's turn to be good as they (badly) seek equilibrium. Here's hoping they find it.
PS, Zong knows more about Rachel than you, like most people.