Control Warrior is one of the classic archetypes in Hearthstone. Once upon a time, it was known as “Wallet Warrior” because of how expensive it was (sometimes even over 10k Dust, which is actually not that much these days). The deck’s general game plan is to remove everything opponent plays while gaining a lot of Armor through Hero Power and other cards, and then win the game by dropping some high value minions. More recently, Dr. Boom, Mad Genius has became an alternative (or rather the main) win condition, giving the deck basically everything in a single card (removal, Armor, value, tempo).
Control Warrior has dodged the nerf bat in last expansion, but it did not in Saviors of Uldum. Dr. Boom’s mana cost was upped to 9, and then (while not directly) the class also got hit by changes to the Discovery mechanic (class cards show less often, and discovering class cards was common in Control Warrior). The deck is still strong, but it’s no longer the powerhouse it used to be at the beginning of this expansion.