Although the European powers introduced some changes to the people and culture in what is today Haiti, the greatest influence on the modern day culture came in the form of slavery. The French brought in many slaves from Africa to work and today nearly the entire population of Haiti is ethnically African. With these people came a fairly drastic change in the culture, but not in the lifestyle. Most people continued to work the land, however the majority of people came from numerous parts of Africa, creating an odd culture that mixes African and French influences. Although nominally Catholic, many people also practice aspects of voodoo, which has roots in Africa. The Haitians' foods, language, dress, and other aspects of life also tend to be a combination of French and African as most people speak French creole, but eat foods that more strongly reflect that of the Caribbean and Africa.
Despite sitting in the middle of the Caribbean and sharing an island with the Dominican Republic, Haiti is very unique in the world as it boasts the first "black republic." Plus, the French influence stands in contrast to the British and Spanish influence of neighboring countries, making the country even more unique.
Despite the differences from island to island and between the French and Africans, the one consistency between these latter two groups is that the center of society is family, friends, and socialization and this is impossible to miss in Haiti. The people are friendly and outgoing as personal life is more important than work life. Between the natural disasters and the preference to enjoy life, there is little doubt why the economy is stagnant, but to the Haitians that's secondary to enjoying life so long as they can provide for their families and friends.