Yes, Whizbang is a godsend for free to play players but if you're someone who is already collecting everything he's useless.
It's a nice challenge since you have to play all the decks, some of which might be very bad, or bad at your current rank and meta.
But about the recipes...I've been collecting since like, Gadgetzan, and I and played a ton up until the last expansion, and I preordered the last 2 or 3 expansions. Despite this, I just checked and I can run the following non-basic recipes:
0/2 warrior
0/2 shaman
0/2 rogue
0/2 paladin
0/2 hunter
0/2 druid
0/2 warlock
0/2 mage
0/2 priest
So I'm at a grand total of ZERO non-basic recipes I can currently build despite playing, crafting, preordering, tavern brawling, and daily questing a ton. Heck, I can't even make some (most?) of the classic recipes, and only a few of the other recipes (3-5?) are even at 29/30 for me. Most seem to be around 26/30. Getting to mess around with 18 decks that I can't make right now, for the price of one card, while also making them golden? Yes please.
Also we are STILL at 18 deck slots despite a billion cards. You can just copy and paste now, but why can't we have 27 slots or something?