So the expansion has been out for around 5 days. I only had saved enough for 50 packs so a limited cardpool. I have around 2400 dust available and will continue to grind packs until the end of the month before I start saving for next expansion.
There have been some subtle changes to the meta. The Secret/Tempo mage seems to be the 'pirate warrior' right now, basically any deck you build has to be able to deal with that or immediatly fails.
The no minion hunter is solid, but I have not crafted the weapon yet so have not run it. The spellstone is amazing though. You can run a beast/secret/spellstone deck and just destroy people, but the draws are too inconsistent I think long term.
Warrior has some nice control decks, but as I stopped crafting warrior cards a while back, I will never be able to make them.
The priest decks are all strong, but not as overpowered as you might think, the secret mage seems to win most of those, as can the elemental control mage. I have made both mages and done well with them, once again without the legendary weapon.
Paladin has some meme decks, I am still performing well with a keleseth paladin to which I added zola the gorgon which is a nice flexible legendary that allows you to double up on Keleseth or anothe strong card.
I made a very fun Malygos druid deck that wins more than you would think. The new rares and commons for druid are all good and many interesting decks are born. They really shine against aggro.
Tempo rogue still works, the new weapon and the ambush guy are solid and give rogue a lot of options.
Warlock has the new demon decks which are strong (still need to craft Guldan)
Shaman has the old decks, the new cards are terrible. Shaman still paying for past sins.
So all in all a decent expansion, should be fun for another couple of weeks until the power decks emerge for certain. Nice thing is that since the overall power level of the expansion is down, I don't need to grind/craft nearly as many cards this time.