Do you think there is some tablet out there that defines what rate you should get for your next mortgage for all lenders? This is not the case. In fact, you need to insure that you select a mortgage lender that will provide the best rate for you. That means comparing several as all have different qualifications and standards that they follow.
One key reason to work with a mortgage lender over others is their personal service. Consider how easy it will be to work with a company that always takes the time to return your phone calls and keeps you up to date with their process? If you have trouble reaching the lender as it is, what do you think will happen after they have your money?