So I've pretty much stopped playing Hearthstone. In the last ladder I got to about rank 15. I think my total stats are like ~180 overall, paladin & mage the highest @ level ~32.
I think I just leveled up high enough, that the matchmaking consistently gave me opponents who just curbstomped me. Every time.
I hadn't bought packs at all except one time, so I had only 1 random legendary in my collection. On the other hand, almost all opponents I got were gimmick decks with 2x or 3x cherry-picked legendaries. So I think I reached the glass roof of playing free-to-play.
Also I had basically all basic, expert, common and even most of rare cards, so 95% of the time, when I lost an arena, I got rewarded with nothing and had to grind the daily quests over 4 days to get the gold for the next run. When I did get something in the reward pack it was usually a crap rare or epic card. Blowing up useless cards for dust is so ineffective I got about 1000 dust over my total play time which is slightly over half a legendary. Naturally I never got a legendary from an arena reward pack, even over about 200 total wins.
It was also starting to become a pretty shallow experience as far as the variety of opponents. People just play safe classes and decks in constructed, even in casual. Very little imagination. 99% of decks for the most common classes have certain cards that absolutely everyone drafts. Third of every mage deck is hard removal. Every priest drafts every shadow word and the heal-buff/card-draw minions. And mind control.
Hardly anyone was playing anything except mage and priest. Occasionally a paladin with a divine shield / buff gimmick deck or a hunter solely for the card draw gimmick. Very rarely there was a druid taunt deck or a warlock murloc / boardspam deck but the insane popularity of hard removal makes those almost impossible to sustain. Even warrior rush decks were becoming rarer and rarer.
So yeah, I got danced over most of the time and there was hardly any personal advancement any more. Thus it stopped being fun to play. That's pretty sad because the game went from addicting and fun to utterly frustrating in only a couple of months.