I opened 150 packs and the meta is very refreshing. It does seem there was a higher threshold than in the past, but for someone meeting that threshold, this is the most fun I've had since the week following Old Gods release.
I had a bunch of gold saved up and purchased the $50 bundle. My method is to open 125 packs (50 from the bundle, rest from gold) and then buy 5 at a time with gold until I get a legendary. This time that took me up to 150 packs. I had no significant difference in duplicates compared to other expansions. There are always lots. This is just a bunch of people who have no idea how statistics work. Yeah, I am not happy to have opened 6 chittering tunnelers (epics) and zero of other epics, but the upside is I have dust to craft other stuff. Even one of them was golden, so it's a full other epic if I want.
For the record, my 150 packs was every common and rare except for one copy of 1 rare card (Corrupting Mist). I am missing 20 epic cards and got 7 total legendaries. My overall pull was slightly better than average on epic pulls and slightly under average on legendary pulls. I had 7000-7500 spare dust only from these packs and dusing golden cards that I had 2 non-goldens for (so... not counting hall of fame dust.) I've since crafted 2 quests (rogue and warrior) and an epic or two to go along with the decks I've been playing (couple priest decks, elemental shaman, quest rogue and warrior so far.)
50-60 packs never seemed enough for the game to be really fun. There is SO much fun to be had the first 2 weeks of an expansion and a month or two later the fun is gone. But if you at least keep up with the dailies, those 2 weeks become pretty possible with just the $50 pre-sale bundle. It's really important to spam your gold on the first day to get lots of packs, or else you have such an incomplete collection that you have to really compromise on decks you can kludge together.
I'm not sure I agree with the argument that quests are required to have fun this expansion. There's really 2 out of 9 strong quests (Rogue and Warrior), 2 that are pretty good (Shaman and Mage), 2 that are okay at best (Druid and Priest), and 3 trash tier (Hunter, Warlock, Paladin). There are a lot of quite viable decks that don't need quests right now. Elemental Shaman has been very consistent against quest rogue and is okay into quest warrior. Dragon Priest and miracle rogues are still a thing both without quests. Zoo and Hunter are clearly best without the quests, etc... I watched TidesofTime storm through ranks into legend with an murloc-ey paladin. That's what is so fun about the first few weeks. Decks are not refined and you can try all kinds of stuff. As long as you have some of the basic concepts of deck design, you can come up with some "decent" lists that will eventually get crushed by refined lists, but for now they do well enough.