Paraphrased from Reddit: HearthStone is like that girlfriend who's no good for you but to whom you've become too attached to leave.
I've been playing since BRM, and despite trying to quit several times (I actually managed to for 3 weeks just before and during KFT), I just can't seem to pull myself away.
I often feel mysteriously pressured to play every day -- or at least enough to knock out daily quests every 3 days. Part of that feeling comes from having spent so much time and money on this game that I can't bear to drop all the "work" I've put in.
Advise I would give to any player is to avoid watching the "Salty" streamers. While Kripp certainly speaks more truth than not, it's easy to let his negativity get in your head and jade your experience. (Instead, watch Kibler, DisguisedToast, Savjz, etc.)
Overall, HS is worth playing -- especially if you're familiar with Blizzard's universes. However, it costs a significant amount of time and/or money to "keep up".