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I opened 70 packs and got 12 Legendaries. I would still prefer to get a decent number of useful Legendaries in each expansion, rather than getting two in one, zero in another, and six Abyss Striders in the third, hoping that someday it will compensate with a better drop rate.
I could open another 110, but my hand is tired, and I'm not sure it's worth it – I don't have nine cards from the pack, seven of which are Legendaries, and I don't play most of the classes.
I added Miriam to my deck, played a bit in ranked, and liked it. It's a shame that they didn't add more new cards.