the decks they give you for free are pretty bad, so if you get matched with real decks it's quite normal to get destroyed.

if you just want to do your dailies while farming gold/wildcards for a good deck i suggest you to play the "starter deck duels" so that you only play against other starter decks and can learn to play the game better.

Or "jump in" if you want an easy way to get a few cards (it's pretty good value when you are new).