Well when you are a 3rd estate you are the ones getting screwed. Your are constantly being pushed around by the Clergies because they are the first estate. Its like being in America, Upper Class, Middle Class, and The Lower Class. The first estate pays less money in taxes, normally the kings family and friends, The middle class (kind of friends) who pay a little bit more in taxes then the first estate. The third estate pays the most taxes, is governed the most, and is only allowed to have a small bit of land. They are technically Pheasents in an aspect.
My concerns would be high taxes, Low size in land, and Being pushed around by the wealthier estates.