A new survey by quality guru J.D. Power and Associates says that when it comes to real estate companies, home buyers and sellers aren't exactly happy campers.

The query, which included evaluations from more than 2,790 people who bought or sold a home between March 2011 and April 2012, measured customer satisfaction with the largest national real estate companies.

Overall satisfaction among home buyers averaged 789 on a 1,000-point scale, the lowest in five years. Satisfaction among sellers was worse, averaging 768 — compared with 779 in 2011. Usually, the dissatisfaction could be traced to an unsatisfactory relationship with the agent/salesperson.

Christina Cooley, senior manager of J.D. Power's real estate practice, attributes the dissatisfaction to sellers compromising on their listing price, or buyers compromising on the home's size and condition. National companies that ranked highly include Keller Williams (for buyers and sellers) Coldwell Banker (for sellers) and Prudential (for buyers).