Yeah, I'm not really sure it's a big problem... yet. There are several characters that need rebalancing. Last update they rebalanced a few, (the pharaoh got a big buff) and even some other things that were too overpowered (they lowered the stun talismans from 35% stun to 12%). I'm sure they'll do the same to most of the things out of balance. Like Qed said, it takes finesse and fine tuning. In other words, it will take time.

Meantime, other pressing issues like people not being able to play at all and complaints about drop rates from just about everyone are probably going to take precedence. I get the discouragement, but time and patience is going to have its rewards. If you quit the game, I don't blame you. But it might be a better idea if you're feeling like this to just take a break from it instead of quitting it all together.

If they made adjustments on last update, I don't see a reason to assume there won't be more made. If the devs didn't directly respond to your email, I'm sure it's because they have been busy (slammed with thousands of issues every day) and not because they don't care.