It has been thoroughly answered by both myself and ilikeeggs. If you have an issue with one or more of the responses, please rebut them.
Believe it or not, you are a mid-tier player. As you say, you have some understanding of the top decks and some grasp of the core mechanics of the game. This likely puts you at least in the top half of Hearthstone players.
The thing is, the game canât be balanced at all levels of play in a asymmetric game, so you need to decide what level of play to balance to.
Balancing to some arbitrary mid point is historically doomed - I donât have time to get into this right now, so take it as true or do a little background research yourself. This leaves your options to balancing to the lowest common denominator or to the top end of play.
Games that balance to the top end of play, like starcraft, age of empires, the most popular legacy formats of magic the gathering and yugioh tends to lead to a format that will stand the test of time and remain interesting going forward, possibly with minor tweaks. I canât think of any similar examples for games that have balanced around the lowest common denominator.
People enjoy agro because it holds intricate decision making with real consequences, while still allowing you to play enough games to consistently walk away with satisfying wins and satisfying losses. The typical control player is more frustrated than the typical agro player because the typical control player does not always get to walk away with satisfying wins and losses, making their highs much higher and their low nights much lower.
Other levels on which to enjoy agro could include themes - I personally find the beast themes to be very appealing and could understand why people might feel similar about pirates, mechs or murlocs - thrill of discovery - âI was defeated, but then I ripped a Leeroy off the topâ can provide a rush to some players - and the texture of wins and losses - one thing that is often renowned in fictional strategists like Ender from Enderâs Game tends to be their ability to find the shortest path to victory; I could see how this might give some that fantasy.
There are more factors, of course, including many offered in this thread. The fact is that you donât want to understand them because you are a scrub - err, I guess snob or elitist is a preferable way of saying this? - who has laid out an arbitrary set of rules for their opponent and expects their opponent to play by those rules.
If you actually wanted to understand agro, you would have done so by now. Instead, you choose to continue to demand that players continue to justify its existence because it does not fit within your set of rules.