The reason I play Hearthstone is because of the wild and unpredictable interactions that happen when the fantastic creativity of the design team is allowed to run wild. When you do find those decks - viable ones with an affordable price point - they're usually bog-standard aggro decks that don't take advantage of any of the most exciting and interesting parts of Hearthstone. If you check the meta on HSReplay and want to try a deck that covers your existing one's weaknesses, it's extremely challenging to find one that doesn't rely heavily on Epic and Legendary cards - the most expensive and rare of the bunch. If you want to see everything the game has to offer though, it gets wildly expensive. It's genuinely possible to perform well and build a solid collection while playing Hearthstone completely free, but opening up your wallet will give you a very different experience for the most part. I like to have answers for enemy threats, a win condition for later on, and big minions to chuck onto the board to reward my patience. If it hasn't been made clear enough already, my favourite way to play Hearthstone is in a control style. But it's still more than possible to churn out a positive win rate with lowly Priest - it just takes a bit more effort. Even the meta-favouring Warrior continues to dominate.
Non-aggro Priest players aren't doing brilliantly against aggressive decks like Aggro or OTK (one turn kill) Shaman right now. Sure, the Alterac Valley meta isn't fun and games for everyone. In a three-expansion annual cycle, it's always nice to bring a narrative together although I much preferred the over-the-top story that occurred in the Rise of Shadows/Saviors of Uldum/Descent of Dragons cycle, with iconic Hearthstone heroes and villains fighting it out. Other recent expansions have focused on the original Horde vs Alliance war, with Forged in the Barrens focusing on the former and United in Stormwind the latter, so it makes sense to bring them together in competition here. It's the Frostwolf orcs against the Stormpike dwarves, with all kinds of new-to-Hearthstone characters exploring an aspect of the Warcraft universe that hasn't really been touched upon since the early days of Blizzard’s premiere World of Warcraft MMORPG. The Fractured in Alterac Valley expansion brings the lore back to the Warcraft series' roots: scrapping between the Horde and the Alliance.