I'd prefer that the few classes that are under performing in the meta receive a few buffs to bring them in line with the others personally, rather than throw out more nerfs because this meta seems to be one of the healthiest we've seen in a while, with several competitive decks (in standard).
No one class is clearly dominating over all the others right now, like we've had in the past with decks like pirate warrior or shudderwock shaman. The only mild problem I see is that druid can high roll so hard that they can have 10 mana, several very powerful creatures and a full hand off cards as early as turn 4, but it's it's pretty rare and even then, they aren't completely unbeatable. So again, imo we should buff the worst classes slightly and keep the nerfing to a minimum. Just my 2 cents.