For the benefit of the many new players who may want to know how to approach playing the game, do drop by to share how, in your opinion, the collectible card game is best approached, or at least in your experience playing the game thus far :D
For some perspective, I've been playing a little over a year.
I enjoy the game a lot, but from my experience this is because I don't take it too seriously. I'm not a "grinder" who spends all of his time and money on Hearthstone. I do play relatively frequently, but never for too long a duration. I have always played exclusively Wild (even when I was a new player), and I highly recommend doing so if you're on a budget (ironically enough). While the cost per deck in Wild is higher, you get to keep those decks forever so it's a much better long-term investment than Standard, in which you have to invest in a new deck every few months.
TL;DR: Fun if you don't take it too seriously. You may enjoy Wild (financially and in terms of fun), but it isn't for everyone.
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".