Well, Ferals didn't receive any serious nerfs. Insta cyclone is gone, fine. And to be honest, Feral Druid is not overpowered, definitely not. It's just OK. If you play it right you can pretty much beat anyone and not that hard. But it's not op, not even close. And on Retail Feral does a lot more damage then here, here i do not know what's bugged, but i am pretty sure it is not reported, yet. I am trying to understand what is causing this issue. The issue is that Feral Druids are taking way too much damage than they should take. 522 ilvl Feral Druid, bear form + full defensive cooldowns and he died like nothing from a Warrior that wasn't even bursting. Wasn't even fully geared.. But good news it, it will get better within time. It's enjoyable, it's viable, it's okay.
Check out the current bugs
here