That's crap people. Sure, people who are in the horse world for 50 years might get lucky and meet "the one" and know it right away. Even your common buyer may just win the horsey lottery. But it is ridiculous to pass a horse for that reason. Bonds form over time with dedication and trust, not the first time you hop on the horses back. Nor will your first ride by perfect!
Take my current horse. He never was, and never will be, perfect for me, nor I for him. He is 3 inches taller, 4 years younger, and much heavier then I wanted. I hated him the first ride, it was horrid. I trusted my trainer and brought him home on trial. After a week of serious effort, I decided we could make it work. He was so different and strange. He was 4, 16.3 hands (and built like a tank), a OTTB, and sensitive as a brick. I was coming off a hot, sensitive, quick, 15hh QH.
No, he's not perfect, but we've bonded and do well together. I adapted myself and trained him to fit me, and now I think nothing of his size. I trained him, and he is no longer as heavy or dull.
Basically people, don't give up after one ride. Pick a horse that has potential to work for you and go with it. Adapt your expectations and you may suprise yourself. Don't expect a bond to happen, develop it!