Still at war with Great Britain, the colonists were not eager to establish another powerful national government. Three-and-a-half years passed before the states ratified (approved of) the Articles.
As with anyone's first try at something, the Articles of Confederation were not perfect. While they required Congress to regulate the military, for example, they did not ensure that the states would send people to serve.
Eventually replaced by the United States Constitution of 1789, the Articles of Confederation did provide some stability during the Revolutionary War years. Most important, they provided valuable lessons in self-governance and somewhat calmed fears about a powerful central government.
Are there changes in the government that you would like to make?