I am sorry to hear that you spoke with one of the loan officers with Carrington Mortgage and did not get a good feeling from your conversation.
Like Shane said, there is more than one representative of Carrington Mortgage, in fact there are many branches of Carrington Mortgage in the Central Florida are and they are NOT all equal.
I represent Carrington Mortgage as Sales Manager in the Tampa Bay area and I would be happy to sit down with you share my references with you so you may touch base with them and they will attest to my ability to come through when needed.
At the end of the day, it's not 100% the company that you as a realtor work with, it's the relationship you have and the trust you have in the individual you work with at that company. If you form a relationship with a good loan officer, you can be confident that they will find a way to get your buyers loans done regardless of the company they are with...or they will ultimately find another company to work for that will get it done.