Hearthpwn

Murloc Tidehunter

Legendary Murloc

I think it's not all about "aggro" and "control" but about interesting, fun and versatile decks.
Some aggro/tempo decks feel like they require no skill because they are. But not all of them are like that.
I personally prefer control decks, because I love building up my power so I can crush the opponent in late game. Also, I'm a big fan of meme-ish cards that have seen play mostly in control decks, like Archbishop Benedictus or Yogg-Saron, Hope's End.
Still, right before the Witchwood release my absolute favourite deck to play was an Apxvoid's aggressive tempo mage deck, so I can't say that I cling to one of these styles more than the other. 

I had like a HUGE break from Hearthstone some time since "Naxx" 'till "Old Gods" announcement so I missed out on almost all of the "GnG" and "Tournament" content, as well as three adventures. 
I was so hyped for the "Old Gods" expansion which I think is still one of the best in the list, that I returned into the game in spring of 2016 and started to donate. Later I got all the missing adventures and never really got off the game since.
During Year of the Mammoth I was playing because I really liked the meta. It was very versatile and fun. I think that back then "RnG" and "skill" were really in the balance, and you could climb high up the ladder with a lot of fun decks.
Now I don't like the meta so much, however I think that future expansions will make it much more interesting.
For me the strongest asset of Hearthstone right now is its atmosphere. Witchwood , in my opinion, is one of the most atmospheric expansions. I really love Warcraft lore and I think that the Witchwood gives us a whole new chapter in the history of some of Warcraft's main characters, and it even brings new ones. 

Yogg-Saron, Hope's End. Insanely fun card, probably my favourite from the entire game. Want it to somehow be integrated in Standard in the future, despite Toki being avaliable.

Most worthless secret in the entire game