In most countries, the nobility maintained an almost complete monopoly of political power. The higher ranks of the clergy were drawn from noble families, so the church did not represent any kind of check or balance of power. The king, while now generally standing head-and-shoulders above the aristocracy individually, was still fundamentally the first among equals, “merely” the richest and most powerful person of the richest and most powerful family: the royal dynasty of the kingdom.
Despite the social and political changes of the preceding centuries, European nobles continued to enjoy tremendous legal and social privileges. Nobles owned a disproportionate amount of land, and in some kingdoms (like Russia), only nobles could own land. Only nobles could serve as officers in the army, reaping the spoils of war and generous salaries in the process. Only nobles had political representation in various parliamentary bodies, with the notable caveat that cities still held privileges of their own (the parlement of Paris, for example, wielded a great deal of meaningful power in French politics). Nobles had their own courts, were tried by their peers, and would subject to more humane treatment than were commoners. Perhaps most importantly, nobles everywhere paid few taxes, especially in comparison to the taxes, fees, and rents that beleaguered the peasantry.
A whole system of status symbols was maintained by both law and custom as well - to cite just a few, only members of the aristocracy could wear masks at masquerade balls, nobles led processions in towns and had special places to sit at operas and churches alike, and only nobles could wear swords during peacetime. Some of these legal separations were not trivial; only nobles could hunt game, and the legal systems of Europe viciously persecuted poachers even if the poachers were motivated by famine. Non-nobles were constantly reminded of their inferior status thanks to both the legal privileges enjoyed by nobles and the array of visible status symbols.
By the eighteenth century, the nobility actively cultivated learning and social grace, hearkening back to the glory days of the Renaissance courtier and bypassing the relatively uncouth period of the religious wars. Education, music, and art became fashionable in Europe in the eighteenth century, and being witty, well-dressed, musically talented, and well read became a status symbol almost as important as owning a lavish estate. The eighteenth century was the height of so-called “polite society” among the nobility: a legally-reinforced elite that fancied themselves possessed of true "good taste."