Thanks for the feedback, I'm actually about to make a screencast about Quests when they renew in a couple hours!

Quests are very new so everything might change, but right now everyone receives an opportunity to complete a quest every 24 hours. So far, all these have been some variation of "Win 10 ranked matches with the [Death, Life, Fire, etc.] Splinter. This can be a little challenging if you're high on the leaderboards and only have spent time upgrading one deck, but still gives everyone an opportunity to win 1 pack a day, which is really quite amazing for newbies to be able to get $14 of free new cards every week.

This feature won't be around forever as the supply of beta card packs is limited and eventually (like with the Alpha cards) you'll only be able to purchase them on the marketplace from other players. So unless you're moneybags in this game, I would worry more about completing those daily quests than doing well in the rankings :)