Answer:
Louis XVI was neither a bad person nor a particularly “poor king”. He mostly fell prey of the circumstances. During the later part of King Louis XVI, France entered a period of bad weather and food shortages and high prices. Social and economic turmoil resulted and grew. The French people felt their plight was ignored by Louis XVI, the government, the aristocracy, the nation's religious leaders. And the French people were right. Louis XVI appeared to be oblivious to the growing turmoil in France. His government put a tin ear to the problems of the people. The French aristocracy, which defined the French government, was more interested in personal intrigues, personal and political dalliances and byzantine power plays at court.
In hindsight, the French Revolution was easily avoidable had Louis XVI been an intelligent, energetically active, and reformist king who realized France needed repair and reform. But Louis was not a strong and observant man and he was thoroughly insulated and buffered at the French court by ministers and courtiers who did their best to try to gain the king's personal attention while convincing him everything was alright in France.
Unfortunately for French history, Louis XVI was the wrong man for the throne at the wrong time. There were stronger, more capable earlier Louis kings but when another strong one was needed, it didn't happen.
Explanation:
It's true that he failed to thoroughly overhaul France's intricate taxation systems and privileges, but he did carry out substantial reforms notably with the help of Ministers Turgot and Necker.
He also had some insight : if it hadn't been for him and Vergennes, France would have never taken part in the American War of Independence - which might have been a terrible decision from a financial standpoint but nontheless contributed to the “grandeur” that's so important to the French psyche. And, as it's rarely mentioned, he's the one who outlawed torture, which used to be readily resorted to as part of the judicial process.
As a man, Louis XVI was the subject of much ridicule. Paradoxically, his shortcomings would earn him praises nowadays. He was sneered at for an alleged impotence because he didn't have any mistresses or didn't force himself upon his young wife Marie Antoinette. Nowadays, he would be labelled a “nerd" but at the time his hobbies were deemed unbecoming for a man his standing : he was into locksmithery and geography, and enjoyed strolling on the roofs of Versailles.
He didn't fit in the high society as he was a very clumsy dancer, liked to go to bed early and was also very short sighted, making social interractions awkward as he would often fail to identify people properly.
His main shortcoming was his deep religiousness, so much that he had moral qualms about having his own people shot at. It goes without saying that had Louis XIV been on the throne at the time, the Revolution wouldn't have happened.