First off - this post is not a whine nor is it unreasonable; it's simply a 'who do you think based on wildly small sample size'. It's a fun discussion to have, not a serious overreaction on what has to be done or 'Blizzard failed!'.
Anyway, I'm having a hard time seeing any single OP card yet. Murloc Shaman seems terrifying with how quickly it can fill its hand and re-claim the board, but I don't think it's anything to worry about as the control tools seem to be there (especially that vault / safe mech deathrattle card). I've heard a lot of complaints about Warrior, but I haven't faced enough of them to get a sense for it yet.
All-in-all, I'm digging this expansion so far. Lots of action happening on the board which is how I like my Hearthstone.