Every time I go to arena and finish drafting I always feel like I regret it. Yet I keep going back. I didn't see any 1 mana cards show up until after like 20 cards...
You very, very rarely want to draft 1 mana cards anyway. Like when you're drafting minions, the only neutral 1 drop minions you should be drafting are zombie chow and worgen infiltrator. 2's, 3's, and 4's are where you want to prioritize.