You're doing it wrong. The only reason to play the solo adventure is to get the cards to build decks (aka once) or if you want to challenge yourself a lot do it on heroic.The fun is playing against humans.
I saw Mad Max today. It shouldn't have even been called Mad Max, he basically didn't nothing int he movie and was just an accessory to Charlize Theron and the hot bishes.
Still an awesome movie, though.