I agree that this is worth questioning. These particular cards have the potential to stall a game in a way that removes elements of fun from the matches. Once your opponent has them in hand, they are either played right away or held onto until such a time as their benefits are optimized, and that latter scenario forces you to sit on your hands and actually avoid making gains in order to prevent your opponent turning them against you. White Lotus in particular becomes an arms race where no one acts until he has a hand full of Uncommons and Rares that can see him through the use of the balancing.
They do have their charm, and turning the tide of a match with the quick play of a lucky draw can be exhilarating, but that obnoxious stalemate that often occurs when it's not immediately played really kills the fun, and for both players.