Battletag: Aramchek#2159 Region: EU Trade Only?: Yes, you go first.
That was really unlucky!
Next time try to save some gold.
I've bought 50$ pre-order and saved 8000 gold (spent only 6500 of it and opened total of 121 packs including 6 free packs). Which gave me 8 legendaries (one of them is golden) +1 golden from pre-order and +1 from logging in = 10 legendaries in total.
By the way just open 10 more packs and you should find another legendary.
Actually you get Golden Zayle, Shadow Cloak plus Golden Classic Card Pack which has 10% chance to give you a Golden Legendary. If you've opened a Golden Classic Pack before and couldn't found a legendary, your chance is higher than 10%.
Plus you get a nice single player content and card back for the same amount of money for buying packs.
Therefore I suggest getting the advanture.